Corfu's entire population once lived within the walls of the Old Fortress, or Citadel, built by the Venetians in 1546 on the site of a Byzantine castle. Separated from the rest of the town by a moat, the fort is on a promontory mentioned by Thucydides. Its two heights, or korypha ("peaks"), gave the island its name. Standing on the peaks, you have a gorgeous view west over the town and east to the mountainous coast of Albania. A statue of Count Schulenburg, an Austrian mercenary who became a local hero in 1716 when he helped to defeat the invading Turks, stands at the fort's entrance; a plaque beside the statue tells Schulenburg's story. Inside, there's an exhibition of Byzantine art and a shop with museum copies, while a second hall hosts changing events. Most of the old Venetian fortifications inside the fortress were destroyed by the British, who replaced them with their own structures. The most notable of these is the Church of St. George, built to look like an ancient Doric temple. Near it, overlooking Garitsa Bay, there is a shaded café where you can sit and enjoy the splendid view.