Did Da Vinci hide clues in his art? - Digging For The Truth | Sky HISTORY TV Channel

Did Da Vinci hide clues in his art? - Digging For The Truth

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What (or perhaps who) is the holy grail? And could a descendant for Jesus and Mary be walking the streets today? (Season 2, Episode 4)

Buildings appear to float in the clouds

A city appears to float among the clouds - Phantom Signals

Atomic bomb explosion

We'll all be dead if this signal ever stops - Phantom Signals

A triangular-shaped UFO coming down

Witness accounts of an alien spacecraft - Ancient Aliens

A portal carved into the side of a stone wall

Does this ruin contain a portal to another universe? - Ancient Aliens

A little boy using a radio to call for help

Mystery surrounds seven-year-old's radio distress call - Phantom Signals

Sound waves

A low frequency hum that's driving everyone crazy - Phantom Signals