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Proponents of the Ancient Astronaut Theory claim that the Earth has been visited by extraterrestrial beings for millennia and these beings have brought us knowledge of agriculture, mathematics, medicine, architecture and metallurgy.

The Sanxingdui culture was highly developed and dates back more than 5,000 years, but there are no historical records and it disappeared as mysteriously as it appeared.

The spiritual leader Dalai Lama shares his views on what we should do in case an extraterrestrial visitor comes to Earth.

The Hangar 18 at Wright-Patterson Air Force Base supposedly contains UFO technology and extraterrestrial bodies.

"Some of the discs carry crews, others are under remote control, the bodies of visitors, and also the ship, materialize on entering the vibratory rate of our dense matter", states the FBI document.

Could the theories of the multiverse and infinite parallel realities connect the UFO phenomenon and interdimensional travelers called Bigfoot?

The Black Knight Extraterrestrial Satellite theory has been extremely popular among the ufologists, but it was first introduced in 1899 by Nikola Tesla.

Is humanity close to making contact with intelligent extraterrestrial beings?

This event took place in a desert area of Canada during extreme weather conditions and would have forced the military to cover up once again the clues of a UFO crash.

One of the most beautiful sculptures left by the Mayan Civilization is still soured by mysteries and controversies.