A closer look at the awe-inspiring structures that capture imaginations, including the Olmec Heads of Central America, the Alhambra in Spain and Angkor Wat in Cambodia.
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New theories may shed light on the fate of aviator Amelia Earhart, hijacker D.B. Cooper and the three daring prisoners who escaped from the Alcatraz Federal Penitentiary.
Newly declassified documents may link the Roswell crash to Nazi science fresh evidence may reveal what's really hidden inside Area 51 experts investigate the dark secrets of the Dugway Proving Ground.
Experts investigate disturbing phenomena at Skinwalker Ranch top-secret experiments may have been conducted at a former Air Force base in Long Island, N.Y. new theories may explain why Mount Shasta is a magnet for paranormal activity.
Large unidentified objects appear over Kremlin and Pentagon.
Billy Meier's UFO photos and prophecies bring him fame and controversy.
Claims suggest secret space programs have sent humans to Mars.
Explore years of mountain lion sightings in New England via experts & witnesses in a heated regional mystery.
Casefiles uncovers the hidden stories behind various Small Town Monsters films.
Central Scotland has its very own Area 51, known as the Falkirk Triangle, encompassing the village of Bonnybridge, which claims the highest concentration of the region's UFO activity.
A look at the Pentagon's 2020 verification of UFO video footage taken by the U.S. Navy in 2004.
Unsolved urban mysteries include a walrus skeleton found in a mass London grave, Moscow's secret Metro line and Prague's occult origins.
The mysteries of modern science that confound the experts, including time travel, the dark web and the secrets of morphic fields.
Explore the myths and legends of ancient civilizations, from Lemuria and Atlantis to the mystery of the Etruscans and the Forgotten Kingdoms of Tibet.
Paranormal phenomena that baffle experts around the world, from ghostly encounters and spectral curses to spontaneous combustion and the mysterious Hum.
Fending off a swarm of aggressive UFOs with a U.S. warship an alien voice takes over a British TV broadcast an Australian teacher who was threatened after a UFO sighting at school exploring who the Men in Black really are.
A mysterious doorway on Mars victims of a UFO in the Amazon an alien party crasher at the Queen's Jubilee in London animal mutilations in France a video of otherworldly visitors to Turkey.
A look at a series of metal cubes seen spinning in the sky over Earth exploring the origin of an angel-shaped apparition China's interest in aliens a metal alloy that may power UFOs scareships.
Three eerie stories that suggest there is indeed life after death: A Connecticut man believes he is the reincarnation of a dead general scientists in England conduct a series of groundbreaking séances and what they find defies logic and, in Haiti, a man dies from a mysterious illness but returns from the grave 20 years later!
People search for Bigfoot in North America's dense forests.
New theories about the Mantell UFO incident are revealed scientific evidence may explain a UFO encounter in Texas experts investigate what really crashed into a Canadian harbor.
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