The truth behind a pattern of UFO sightings near volcanoes. The origin of the strange stone spheres of Costa Rica. The secret of an unidentified man living alone in the jungle.

Is a serpentine monster lurking under the water in the London's Thames River? And were UFOs spotted crossing the moon? And, how are some people able to defy the fear of heights?

A UFO spotted over one of the world's holiest sites. And could a mysterious floating spaceman in a famous photograph be an elaborate, decades-long hoax? Plus, superhumans who can stop cars barehanded.

Could a prehistoric-looking creature washed ashore in Georgia be something new to local scientists? Is a death-defying experience for a toddler proof of guardian angels? And did a UFO spotted in Canada burn up in the atmosphere?

Sighting of a UFO from the window seat of a passenger jet. A strange underwater discovery is said to be a lost Japanese city. A series of tunnels in Brazil. Tony and team investigate some of the world's strangest photos and videos.

The team looks into a new sighting of Sasquatch in the trees of California. Are streaks in the night sky in Australia proof of aliens down under? And, has a man captured footage of the infamous Fresno Nightcrawlers right in his back yard?