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Popular Conspiracy Theories That Leave Us Scratching Our Heads

Lily Tredwell  | 9 hours ago

Some People Believe the Apollo 11 Moon Landing Was a Hoax

One of the most enduring theories suggests that the 1969 moon landing was reportedly staged on a secret film set rather than the lunar surface. Believers often point to the American flag, which appears to "wave" in a vacuum, or the absence of stars in the background of NASA’s photographs. While scientists explain these phenomena through physics—such as the flag’s horizontal support bar and the camera’s exposure settings—many skeptics remain unconvinced.
Some People Believe the Apollo 11 Moon Landing Was a Hoax
NASA / wikimedia commons
They allegedly believe the U.S. government was so desperate to win the Space Race against the Soviet Union that they hired a famous director to fake the entire mission.

The Titanic and Olympic Switch

A popular maritime theory suggests that the ship that sank in 1912 was reportedly not the Titanic, but its sister ship, the Olympic. The claim is that the White Star Line switched the two vessels as part of an insurance scam after the Olympic had been damaged in a previous collision. Theorists allegedly point to subtle differences in the portholes and the "Titanic" nameplate as proof of the deception.
The Titanic and Olympic Switch
Courtesy of NOAA / wikimedia commons
While historians note that switching two massive liners would have been nearly impossible to hide from thousands of workers, the idea of a high-stakes corporate switcheroo continues to fascinate history buffs.

The Flat Earth Theory

Despite centuries of scientific evidence, a growing group of people reportedly believes that the Earth is a flat, stationary disk rather than a globe. According to this theory, the North Pole sits at the center, while a massive wall of ice—Antarctica—surrounds the edge to keep the oceans from spilling over. Proponents often claim that satellite images are digitally manipulated and that gravity is an illusion.
The Flat Earth Theory
Towarzysz Przewodniczący / wikimedia commons
They allegedly argue that if the Earth were truly a spinning ball, we would feel the movement or see the curvature from an airplane, leading them to reject traditional geography in favor of this alternative model.

The Theory That Paul McCartney Passed Away Decades Ago

A fascinating legend from the late 1960s claims that Beatles member Paul McCartney reportedly passed away in a car accident in 1966 and was replaced by a lookalike. Fans spent years scouring album covers for "clues," such as Paul walking barefoot on the Abbey Road cover or hidden messages when playing records backward. While Paul is very much alive and touring today, theorists allegedly believe the band dropped these hints out of guilt.
The Theory That Paul McCartney Passed Away Decades Ago
Jim Summaria / wikimedia commons
It remains a classic example of how deep fans will dive into pop culture to find hidden meanings where most people only see great music and art.

The Denver International Airport Mystery

Since its opening in 1995, the Denver International Airport has reportedly been at the center of wild theories regarding secret underground bunkers and occult symbolism. Visitors often point to the strange, apocalyptic murals and the "Blue Mustang" statue—nicknamed Blucifer—as evidence of a dark agenda. Some allegedly believe the airport was built by a secret society to serve as a headquarters for a new world government.
The Denver International Airport Mystery
Tucker Gladden / wikimedia commons
While airport officials have leaned into the mystery with humorous marketing, theorists continue to speculate about the massive amount of earth moved during construction, suggesting a sprawling city exists beneath the runways.

The Loch Ness Monster as a Prehistoric Survivor

While "Nessie" is often seen as a fun myth, many conspiracy theorists reportedly believe the creature is an actual plesiosaur that somehow survived extinction. They argue that the deep, murky waters of Loch Ness contain hidden underwater tunnels leading to the sea, allowing the creature to hide from sonar. Believers allegedly claim that the famous "Surgeon’s Photo" from 1934, despite being revealed as a hoax, was part of a larger cover-up to protect the creature’s habitat.
The Loch Ness Monster as a Prehistoric Survivor
StaraBlazkova / wikimedia commons
Even today, high-tech searches of the loch continue to draw thousands of enthusiasts hoping to find proof of this ancient mystery.

The Lizard People (Reptilians)

One of the more out-of-this-world theories suggests that many world leaders and celebrities are reportedly shape-shifting reptilian humanoids from another dimension. According to this theory, these "Lizard People" have infiltrated human society to control our resources and steer our history. Theorists allegedly spend hours analyzing video footage for "glitches" where a person’s eyes appear to change or their skin looks scaly. It soundss like science fiction.
The Lizard People (Reptilians)
JD Lasica / wikimedia commons
But a surprising number of people believe this secret elite is responsible for the world’s major conflicts and economic shifts, all while wearing "human suits" to blend in.

Shakespeare Didn’t Write His Plays

For centuries, some scholars and theorists have reportedly questioned whether William Shakespeare, a man with a modest education, could have written such complex and worldly plays. The "authorship question" suggests that the works were allegedly written by someone more prominent, such as Francis Bacon or Edward de Vere, who used Shakespeare as a front. Proponents point to the lack of records regarding Shakespeare’s personal life and education as evidence.
Shakespeare Didn’t Write His Plays
Oli Scarff / wikimedia commons
While the vast majority of historians believe the Bard of Avon is the true author, the mystery of how he gained such vast knowledge remains a popular literary conspiracy.

The "New" New York City (The Underground)

There is a fascinating theory that a massive, secondary city reportedly exists beneath the streets of New York. While we know about the subways and utility tunnels, some theorists allegedly believe there are secret floors beneath famous skyscrapers and entire "mole people" communities living in forgotten luxury bunkers. Stories of secret tunnels connecting the Waldorf Astoria to Grand Central Terminal for VIPs like FDR fuel these claims.
The "New" New York City (The Underground)
danielcgold / wikimedia commons
While most of these spaces are just old infrastructure, the idea of a "Shadow New York" right under the feet of millions of commuters is a classic urban legend.

The Nelson Mandela Effect Theory

The Mandela Effect is a phenomenon where large groups of people reportedly remember an event or detail differently than how it actually occurred. The name comes from the collective, yet false, memory that Nelson Mandela passed away in prison during the 1980s. Other popular examples include the Berenstain Bears being spelled "Berenstein" or Monopoly’s Rich Uncle Pennybags wearing a monocle. Some theorists allegedly suggest this happens because of "glitches" in the universe or that we have somehow slid into an alternate reality.
The Nelson Mandela Effect Theory
South Africa The Good News / wikimedia commons
It leaves many scratching their heads, wondering why their memories don’t match the history books.

Area 51 and Alien Technology

Nestled in the Nevada desert, Area 51 is a highly classified military facility that has reportedly been the site of extraterrestrial research for decades. While the government eventually acknowledged its existence as a testing ground for experimental aircraft, conspiracy theorists allegedly believe that crashed UFOs from incidents like Roswell were taken there for reverse-engineering. Stories of "grey aliens" and advanced propulsion systems have become a staple of American lore.
Area 51 and Alien Technology
David James Henry / wikimedia commons
Despite the lack of public evidence, the extreme secrecy surrounding the base continues to fuel the belief that the government is hiding technology that originated far beyond our solar system.

Chemtrails Vs. Contrails

If you’ve ever looked up and seen long-lasting white streaks behind a jet, you’ve seen what conspiracy theorists reportedly call "chemtrails." Unlike standard condensation trails, or "contrails," which dissipate quickly, these trails allegedly contain chemical or biological agents sprayed for nefarious purposes like weather control or population management. Scientists explain that contrails linger depending on atmospheric humidity and temperature, much like your breath on a cold day.
Chemtrails Vs. Contrails
Fulvio Spada / wikimedia commons
However, skeptics often argue that the patterns of these lines are too deliberate to be accidental, leading to ongoing debates about what exactly is being released into our atmosphere.

The Hollow Earth Theory

Dating back to the 17th century, the Hollow Earth theory suggests that our planet is reportedly not a solid mass, but contains a vast interior space, perhaps with its own sun and civilizations. Some versions of the theory claim there are massive openings at the North and South Poles that lead into this inner world. Explorers like Admiral Richard Byrd are allegedly cited by theorists as having discovered these entrances during polar expeditions.
The Hollow Earth Theory
MATTYMOO101 / wikimedia commons
While modern geology and seismic data prove the Earth has a solid crust and molten core, the idea of a hidden world beneath our feet remains a popular theme.

The Dead Internet Theory

A relatively new theory suggests that the "real" internet reportedly died around 2016 and is now mostly populated by bots and AI-generated content. According to the "Dead Internet Theory," most of what we see on social media—comments, likes, and even news—is allegedly created by algorithms to influence human behavior or keep us engaged for profit. Believers point to how repetitive certain online discussions have become as proof that we aren't talking to real people anymore.
The Dead Internet Theory
Santeri Viinamäki / wikimedia commons
It’s a chilling thought for anyone who spends a lot of time online, wondering if they are the only human in the "room."

Disney’s Frozen Secret

A lighthearted but persistent theory suggests that the movie Frozen was reportedly created to hide a dark secret about the company's founder. For years, a rumor circulated that Walt Disney was cryogenically frozen and hidden beneath the Pirates of the Caribbean ride at Disneyland. Theorists allegedly claim that the movie Frozen was titled specifically to manipulate internet search results; so when people searched for "Disney Frozen," they would find the movie instead of theories about Walt’s body.
Disney’s Frozen Secret
HarshLight / wikimedia commons
While the Disney family has denied the cryogenics story, fans love the idea of a secret hidden in plain sight.

Birds Aren’t Real

What started as a satirical movement has reportedly grown into a massive online "conspiracy." The "Birds Aren't Real" theory jokingly claims that the U.S. government replaced all birds with surveillance drones between 1959 and 2001. According to the "lore," birds sit on power lines to recharge their batteries and poop on cars to track individuals with liquid sensors. The creator has admitted it’s a parody of how misinformation spreads.
Birds Aren’t Real
Prosthetic Head / wikimedia commons
But many people reportedly treat the "evidence" with the same fervor as real conspiracies, making it a fascinating look at modern internet culture and the nature of belief.

The Mothman Prophecies

In the late 1960s, residents of Point Pleasant, West Virginia, reportedly witnessed a large, winged creature with glowing red eyes known as the Mothman. Conspiracy theorists allegedly believe this creature was either an alien or a government experiment that appeared as a harbinger of doom before the tragic Silver Bridge collapse. Many reports suggest that "Men in Black" visited witnesses to silence them following the sightings.
The Mothman Prophecies
Peter Parnell / wikimedia commons
Whether it was a collective hallucination or a genuine paranormal event, the Mothman remains a haunting figure in American folklore that continues to draw investigators to the small town every year.

The Kurten-Daimler-Benz "Car Murder"

In certain circles, there is a theory that the decline of public transportation in the U.S. was reportedly an intentional "conspiracy" by major car manufacturers. The claim is that companies like General Motors and others allegedly bought up and destroyed streetcar systems in the mid-20th century to force people to buy cars and use oil. While there were legal cases regarding the monopolization of bus parts, historians argue that the rise of the personal automobile was a more complex social shift.
The Kurten-Daimler-Benz "Car Murder"
George Chernilevsky / wikimedia commons
Still, the idea of a "transit assassination" remains a popular way to explain why we spend so much time in traffic.

The 27 Club

The "27 Club" is a theory that suggests a disproportionate number of popular musicians and artists reportedly pass away at the age of 27. From Jimi Hendrix and Janis Joplin to Kurt Cobain, the list is tragically long. Some conspiracy theorists allegedly believe these deaths are not coincidental but are part of a dark pact or a result of the extreme pressures of the industry that peak at that age.
The 27 Club
LeRenartQuiPense / wikimedia commons
While statisticians have found that there isn't a significant "spike" in deaths specifically at 27 compared to other ages for musicians, the cultural mystique surrounding this number remains a somber topic of discussion.

Secret Societies at Bohemian Grove

Every summer, some of the most powerful men in the world reportedly gather at a private campground in California known as Bohemian Grove. Because the meetings are strictly off-limits to the public and press, conspiracy theorists allegedly believe that world leaders engage in pagan rituals and make major global policy decisions there. A large concrete owl statue and a ceremony called the "Cremation of Care" are central to these claims.
Secret Societies at Bohemian Grove
UC Berkeley, Bancroft Library / wikimedia commons
While members insist it is simply a social club for the elite to relax, the high level of security and influential guest list fuel endless speculation.

Elvis Presley Is Still Alive

After the King of Rock and Roll passed away in 1977, rumors immediately began circulating that he had reportedly faked his own death to escape the pressures of fame. Numerous "Elvis sightings" at grocery stores and airports have been reported over the decades, fueling the belief that he went into hiding. Some theorists allegedly argue that the name on his tombstone is misspelled "Aaron" instead of "Aron" as a secret clue that the man buried there is not the real Elvis.
Elvis Presley Is Still Alive
Unknown author / wikimedia commons
Whether it’s wishful thinking or a genuine mystery, the legend of Elvis living a quiet life remains.

The Hindenburg Was Sabotaged

While the official cause of the 1937 Hindenburg disaster was an electrostatic discharge, many conspiracy theorists reportedly believe the airship was intentionally sabotaged. Some allegedly claim a crew member or a passenger planted a bomb to strike a blow against the Nazi regime, which used the zeppelin as a symbol of pride. Others suggest it was an anti-Nazi protest gone wrong. Despite extensive investigations at the time, no evidence supporting the theory was ever found.
The Hindenburg Was Sabotaged
Murray Becker/Associated Press / wikimedia commons
However, the dramatic nature of the explosion and the political tensions of the era make the sabotage theory a persistent favorite for history enthusiasts.

The Fake Melania Trump

A modern political mystery involves the theory that a "body double" is reportedly used to stand in for Melania Trump at various public events. Theorists often analyze photos of her nose, hair, and height, claiming that the woman standing next to the President doesn't quite match the real Melania. They allegedly suggest that the First Lady uses a decoy for security reasons or to avoid events she doesn't wish to attend.
The Fake Melania Trump
Joyce N. Boghosian / wikimedia commons
While the White House has dismissed these claims as ridiculous, the "Fake Melania" hashtag trends every time she appears in oversized sunglasses or a slightly different hairstyle.

The CIA Invented the Term "Conspiracy Theory"

A meta-conspiracy suggests that the term "conspiracy theory" was reportedly invented or popularized by the CIA in 1967. The claim is that the agency used the term to discredit people who questioned the official report on the JFK assassination, making them look like "kooks." Theorists allegedly argue that by labeling someone a "conspiracy theorist," the government can effectively silence dissent without having to address the actual evidence.
The CIA Invented the Term "Conspiracy Theory"
Moulderkurt.5v / wikimedia commons
While the term existed before 1967, its rise in popularity during that era is often seen by skeptics as a deliberate psychological tool to maintain the status quo.

The New World Order

The New World Order theory posits that a secretive group of global elites is reportedly working behind the scenes to establish a single, authoritarian world government. Believers often cite international organizations and high-profile summits as evidence of this "shadow government" in action. They allegedly argue that major global events are orchestrated to consolidate power and diminish national sovereignty. Most political analysts view these global connections as standard diplomacy and economics.
The New World Order
Christian Cable / wikimedia commons
But the theory remains a powerful narrative for those who feel that the world’s destiny is being steered by a small, untraceable group of powerful individuals in smoky rooms.

The Black Knight Satellite

The Black Knight Satellite theory claims that a mysterious, dark object of extraterrestrial origin has reportedly been orbiting Earth for over 13,000 years. Believers link this object to signals allegedly detected by Nikola Tesla in 1899 and a famous NASA photograph from 1998 showing a strange black shape in space. While NASA identified the photographed object as a thermal blanket lost during a spacewalk, theorists argue it is actually an ancient alien probe monitoring human progress.
The Black Knight Satellite
John Bradley / wikimedia commons
The idea of a silent, ancient observer watching us from the stars adds a layer of sci-fi intrigue to our planet's orbital history.

The Philadelphia Experiment

The Philadelphia Experiment is an alleged military event from 1943 in which the U.S. Navy reportedly made a destroyer escort, the USS Eldridge, invisible to radar. According to the legend, the experiment went wrong, and the ship allegedly teleported from Philadelphia to Virginia and back again in a matter of minutes. Witnesses reportedly claimed that crew members were fused into the steel of the ship or suffered terrible psychological effects.
The Philadelphia Experiment
Rüdiger Stehn / wikimedia commons
While the Navy denies any such experiment ever took place, the story has become a cornerstone of military urban legends involving secret technology and the bending of space and time.

The Georgia Guidestones Origins

Until their destruction in 2022, the Georgia Guidestones were a massive granite monument reportedly inscribed with ten "guides" for a new age of reason. Because the monument was commissioned by a man using the pseudonym R.C. Christian, no one knows who actually funded it. Theorists allegedly believe the stones were a message from a secret society outlining a plan for a global population reduction.
The Georgia Guidestones Origins
Dina Eric / wikimedia commons
The mysterious nature of their creation and the controversial messages carved into the stone led many to view them as a "Satanic" or "Elitist" blueprint for the future, leaving their true purpose a complete enigma.

The Phantom Time Hypothesis

This mind-bending theory suggests that the Early Middle Ages (AD 614–911) reportedly never happened and were simply invented by Holy Roman Emperor Otto III and Pope Sylvester II. According to the theory, the calendar was moved forward by 297 years to place Otto’s reign in the prestigious year of AD 1000. Theorists allegedly point to a lack of archaeological evidence from this period as proof of the fabrication. If true, it would mean we are actually living in the 1700s!
The Phantom Time Hypothesis
Giles Watson / wikimedia commons
While historians argue that astronomical records from other cultures align with our current timeline, it’s a fun "what if" scenario.

The Ice Wall of Antarctica

Expanding on the Flat Earth theory, some people reportedly believe that Antarctica is not a continent at all, but a massive ice wall that keeps the world’s oceans contained. According to this theory, world governments have signed treaties to prevent anyone from traveling past the wall to see what lies beyond. Some allegedly speculate that there are more lands or even other worlds on the other side.
The Ice Wall of Antarctica
Rodrigoanfor / wikimedia commons
While scientists and explorers travel to Antarctica regularly for research, the idea of a guarded "edge of the world" remains a pillar for those who distrust global satellite imagery.

The Montauk Project

The Montauk Project is an alleged series of secret U.S. government projects reportedly conducted at Camp Hero on Long Island. According to the legend, researchers were experimenting with time travel, mind control, and even contact with extraterrestrials. The stories were popularized by Al Bielek, who claimed to have memories of working on the project after "de-programming." Many allegedly believe these experiments served as the real-life inspiration for the hit show "Stranger Things."
The Montauk Project
Mike Peel / wikimedia commons
While the base is now a state park, the rusted radar dish and sealed bunkers keep the rumors of "Project Phoenix" very much alive.

Subliminal Messaging in Advertising

For decades, people have reportedly been concerned that major corporations use "subliminal messaging" to trick us into buying products. The theory suggests that images or words are hidden in frames of movies or on ice cubes in ads, reaching our subconscious minds without us knowing. One famous (and later debunked) study claimed that flashing "Eat Popcorn" during a movie increased sales significantly.
Subliminal Messaging in Advertising
Jaggery / wikimedia commons
While many advertisers admit to using psychology to influence us, the idea that there are "hidden commands" controlling our every purchase is a theory that makes us all look a little closer at the TV screen.

The Knights Templar and the Holy Grail

Centuries after their dissolution, the Knights Templar are reportedly still at the center of theories regarding the Holy Grail. Some allegedly believe the order discovered a great secret or treasure under the Temple of Solomon and went underground to protect it. Stories of the Templars bringing the Grail to Oak Island or Scotland have inspired countless books and movies. Historians view them as a wealthy military order that fell victim to political greed.
The Knights Templar and the Holy Grail
Unknown Author / wikimedia commons
But theorists continue to search for secret codes and hidden symbols in old cathedrals, believing the Templars’ influence—and their treasure—still exists today.

The Mystery of the Mary Celeste

In 1872, the Mary Celeste was found drifting in the Atlantic, completely intact but with its entire crew reportedly missing. Conspiracy theories have flourished for over a century, ranging from pirate attacks and mutiny to giant squids and alien abductions. Some allegedly believe the crew faked their disappearance to collect insurance, while others suggest a "sea quake" or alcohol fumes forced them into a lifeboat that was lost at sea.
The Mystery of the Mary Celeste
Slate magazine / wikimedia commons
The fact that the crew's personal belongings and a six-month supply of food were left behind makes this one of the most baffling maritime mysteries in history.

The Great Reset

The "Great Reset" is a theory that suggests a global economic plan proposed by the World Economic Forum is reportedly a cover for a total socialistic takeover. Believers allegedly argue that the phrase "You will own nothing and be happy" is a literal threat to private property and individual freedom. While the Forum describes the initiative as a way to rebuild the economy more sustainably after the pandemic, theorists see it as a blueprint for a digital currency and a social credit system.
The Great Reset
7C0 / wikimedia commons
It has become a major talking point for those who are wary of high-level global economic planning.

The Super-Weapon HAARP

The High-Frequency Active Auroral Research Program (HAARP) in Alaska is reportedly a favorite target for conspiracy theorists. While it is officially a research facility for studying the ionosphere, believers allegedly claim it is a secret super-weapon capable of controlling the weather, triggering earthquakes, or even performing mind control on a global scale. Strange cloud formations or sudden storms are often blamed on "HAARP activity."
The Super-Weapon HAARP
Michael Kleiman, US Air Force / wikimedia commons
Despite scientists explaining that the facility’s energy is too weak to affect the weather, the "forest of antennas" in the remote wilderness continues to spark theories about government-controlled natural disasters.
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