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.
Experts investigate the mystery of the Bermuda Triangle; researchers seek answers about strange sightings in Massachusetts; a murderer may be responsible for a string of unexplained disappearances in Bennington, Vt.
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.
From the Hudson Valley of upstate New York to the Sedona desert of Arizona, Shannon embarks on a trip to places around the US with a high number of UFO reports.
Three incredible stories where the human body reaches beyond the limits of modern medicine: An Arkansas adrenaline junkie survives a horrific skydiving accident; in upstate New York, a man is vaporized in a fire that leaves investigators with a terrifying question; and, a supercharged British schoolgirl is seemingly able to harness electrical power.
Three ancient artifacts that could turn the history of the world upside down: In Mexico, a bizarrely-shaped skull may prove aliens once walked the planet; ancient stone carvings of dinosaurs could rewrite the story of evolution; and, an ancient wooden model may be proof that ancient Egyptians invented modern flight.
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 new kind of alien; picking apart an abduction case in the UK; learning why NASA is investigating UFOs after decades of denial; looking at time travel.
In the summer of 1952, stories of U.S. Air Force jets chasing UFOs over the White House knock the Korean War off the front pages of newspapers; as rumors spread, President Harry S. Truman demands to know what was flying over his house.
In 1978, UFO enthusiast Paul Bennewitz claims he's intercepted extraterrestrial messages; military officials send counterintelligence officer Richard Doty to feed Bennewitz lies, questioning whether Doty himself is a pawn in an even bigger scheme.
Exploring Sedona, a sacred place for centuries, which is known for its unusual occurrences; with all the activity that's been recorded here, it seems the red desert could double for an intergalactic airport; but what is drawing UFOs to this spot?