mysterious stone circle

Researchers suspect the ancient stone circle of Nabta Playa was used to determine the summer solstice, signaling the coming rainy season.

The copy of the Stonehenge stone circle consists of a cross that is surrounded by stones that form a perfect circle and is followed by a series of megaliths lasting several hundred

The giant stone circles in the Middle East, dating back at least 2,000 years, challenge scientists' answers for decades.