Monemvasia Castle
A fourth-century earthquake separated a cliff from the coastal Greece creating a stand-alone rock on which a castle town was built, its unique location helping hide and protect it from attack. The name Monemvasia derives from two Greek words meaning single entrance. And there is only one way to enter this medieval town by local shuttle bus, whose defensive walls are only apparent once you enter the castle. Your guided tour begins here, with a walk down the narrow passageways and arched alleys, some barely wide enough to fit two people.