CORUM, TURKEY—Three tombs dating to some 2,300 years ago have been discovered in a small cemetery at the Hittite capital city of Hattusha in central Turkey, according to a Türkiye Today report. “What distinguishes these graves is that they are surrounded by a circular stone structure,” said Andreas Schachner of the German Archaeological Institute. The circle measures about 23 feet in diameter. “In this newly discovered grave, the circle has been…