Looming some some 540 meters (1,772 feet) above Ancient Corinth, the Acrocorinth is one of the best naturally fortified citadels in Europe. Citizens retreated in times of invasions and earthquakes, and armies could keep an eye out for approaches by land over the isthmus and by sea from the Saronic gulf and the gulf of Corinth. The moat and three rings of wall are largely Byzantine, Frankish, Venetian, and Turkish—but the right-hand tower of the innermost of the three gates is apparently a 4th-century BC original. Corinth's famous Temple of Aphrodite, which had 1,000 prostitutes in attendance, stood here at the summit, too. On the slope of the mountain is the Sanctuary of Demeter, which you can view but not enter. Take the road next to the ticket office in Ancient Corinth; if you don't have your own car, you can hire one of the taxis that often wait for visitors for the trip up to the tourist pavilion and café (about €5 round-trip), from which it's a 10-minute walk to Acrocorinth gate.
Off E94, 7 km (4½ miles) west of Corinth, Corinth, 20100, Greece