Gobekli Tepe, an ancient site in southeastern Turkey, is believed to be the world's oldest known building, dating back at least 11,500 years. That makes it twice as old as Stonehenge, which was ...

Animal symbols, such as those used at Gobekli Tepe in modern day Turkey, represent star constellations in the night sky, and are used to mark dates and events such as comet strikes, analysis from ...