�Salt Pit� Prehistoric Town in Bulgaria�s Provadiya Built Oldest Stone Fortress Walls in Europe to Protect Its Riches, Archaeologist Says

Some 6,700 years ago the residents of the Solnitsata (â��The Salt Pitâ��) prehistoric town in today’s Provadiya in Northeast Bulgaria built what were Europeâ��s first fortress walls made of stone in order to protect their riches accumulated from the large-scale … Continue reading â��Salt Pitâ�� Prehistoric Town in Bulgariaâ��s Provadiya Built Oldest Stone Fortress Walls in Europe to Protect Its Riches, Archaeologist Says