Imagine sailing across a lake, looking down, and seeing the top of a tower coming up towards you. That's what villagers have been doing for centuries at Lake Kçkçekmece in what is now Turkey. They told archaeologists from Kocaeli University and the Istanbul Prehistoric Research Project that they thought it was the minaret of a sunken mosque. The archaeologists sent divers down and found an ancient lighthouse at the edge of a sunken city. Using documents written by geographers centuries ago, the archaeologists have now identified the city as the ancient Byzantine port of Bathonea. 1600 years ago, the port...