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

For the first time in 2,000 years, tourists will have access to the ancient city of Hegra in Saudi Arabia.

The document was written by a witness at the time and explains how the immense granite blocks arrived at the monument.

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

The intriguing tales of sky beings called Wandjinas who are believed to be the creators of the land and people.

New images caught something big moving under the waters of the lake.

For Jill Tarter, who participates in the project to search for intelligent life beyond Earth, contact with alien civilizations is just a matter of time.

Chinese archaeologists have discovered the remains of "giants" who lived about 5,000 years ago and their bone structure shows they were unusually tall and strong.