Monemvasia, a town located on a small island off the southeastern Peloponnese coast in Greece, is recognized as Europe’s oldest continuously inhabited castle town. Established in 583 AD, the settlement originated as a refuge for mainland Greeks fleeing Slavic and Avaric invasions. The town is almost entirely enclosed within a medieval castle, situated on an island approximately half a mile in length and surrounded by the Myrtoan Sea. Access to Monemvasia is via a narrow causeway connecting it to the mainland. Its unique geographical location and historical significance have allowed for uninterrupted habitation for over 1300 years. The town remains a popular tourist destination, showcasing its well-preserved medieval architecture and offering a glimpse into Greece’s rich past.