Often referred to as the "Gibraltar of Greece," Monemvasia is a virtual showcase of Byzantine, Turkish, and Venetian history dating back to the 13th century. Worth climbing: the steep zigzag path that leads up and up, out of the lower town, to ruins of the fortified upper town, and sweeping views of the Mediterranean Sea. For more information on the Rick Steves' Europe TV series — including episode descriptions, scripts, participating stations, travel information on destinations and more — visit www.ricksteves.com.