Starting in the 6th century and until the 13th century, Corfu residents lived within the walls of the fortified peninsula seen as the summit in the upper right corner. Over the centuries, this became more of a military fort. Therefore, the town of Koryfo grew up outside of the protective walls and in the valley between the Old Fortress and the New Fortress. In the foreground is the Old Quarter, a UNESCO World Heritage Site. The entire city of Corfu (Kerkyra in Greek) has about 30,000 people. The red dome in the center is the bell tower of Saint Spyridon Church.