A small island that's little more than a chunk of rock is connected to the mainland by a short causeway. The village of Monemvasia, founded here on a small plateau, dates back to the 6th century C.E.; the name means “single entrance” in Greek. Cliffs and old stone walls surround the fortress town, a jumble of medieval ruins and restored stone buildings with terra-cotta roofs. The charms of Monemvasia are already well known to tourists, so don't expect to find yourself alone here in summer. But it's a magical destination that's definitely worth a visit.