Sky Trumpets: 5 Frightening Unexplained Sounds from the Sky

Unexplained Cargo, A Foolish Journey and a Boat at the End of the World: 5 Unsolved Mysteries at Sea

The Secret Vatican Time Machine That Photographed Jesus: The Chronovisor

Mysterious Villagers, Metal Alien Spheres and A Lost Island: 5 Unsolved Mysteries of the Arctic

A Ship Stranded in the Desert: 5 Unsolved Mysteries of the Wild West

The Professor Who Fell Through a Rift in Time: The Moberly–Jourdain Time Slip Incident

5 Reddit Posts That Solved Unexplained Mysteries

5 Disturbing Doomsday Plans of the Ultra-Rich

The Mysterious Levitating Statue of Alexandria: 5 Ancient Artifacts That Defied Physics

5 Terrifying Things Humans Have Done to the Earth

The Black-Eyed Children: 5 Most Mysterious Children in History

Skyborne: 5 Mysterious Flying Aircraft Carriers

5 Mysterious CIA Black Sites

Unexplained Islands: 5 Unsolved Island Mysteries

Bricks Made from Astronaut Blood: 5 Strangest Plans To Colonize Mars

The Last Soviet Citizen: 5 People Who Were Last of Their Kind

5 Creepiest Encounters with Extraterrestrials and the Real Men in Black

5 Mysterious Military Lasers and Directed Energy Weapons

Smiled to Death: 5 Terrifying Viruses and Diseases (You Didn't Know About)

True Hell on Earth: 5 Buildings Hiding Terrifying Secrets

3.5-Mile-Tall Tower on the Moon: 5 Mysterious Photos from Space

Ancient Extraterrestrial Artifacts: 5 Unexplained Artifacts of the "Sky People"

Bigfoot Found in America's Deserts: The Yucca Man

5 Secret U.S. Government Tunnels With Mysterious Uses

"I THINK I CAN MAKE IT": Haunting Final Messages from Explorers Who Vanished Without a Trace

Earth's Strangest Experiment: The Mysterious Project HAARP

5 Unexplained Astronaut Encounters with Extraterrestrial Beings and Objects

Beyond Skinwalker Ranch: 5 Most Terrifying Native American Legends

Skyfall: 5 Extraterrestrial Objects Recovered By The Government (Including One Too Massive To Move)

5 People Who Were Hopelessly Trapped Underwater