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Scientists have come up with 12 hypotheses why we haven't detected signs of alien civilizations yet.

For decades, the mystery of the "Sailing Stones" has left many scientists puzzled and unanswered.

An ancient city full of treasures could be buried in the jungle in an unexplored area of South America, between Peru, Bolivia and Brazil.

The cave painting is considered to be the world's oldest record of two people kissing.

Treasure hunters have searched for the Holy Grail for centuries, and hundreds of people have claimed to possess it.

An impressive report of an encounter with a Giant coming out of the waters of the São Francisco River.

The young electrical engineering student disappeared after claiming to create a time machine.

The Bohol Hills are one of the main tourist attractions in the Philippines and their unexplained formation is surrounded by legends.