The smaller of the two peaks at the Old Fortress has several names: Castel a Terra, New Castle, Castle Near the Land and Land Tower. As you walk along its base you’ll see the remains of the Campana Fort and this red clock tower. When you reach the flat, dusty plateau you can explore the ruins of a 1786 prison and a display of Venetian cannons from the 18th century. And be sure to visit the nearby Church of Agios Georgious.