2 Best Sights in Rhodes and the Dodecanese, Greece

One of the great medieval monuments in the Mediterranean, the walls of Rhodes are wonderfully restored and illustrate the engineering capabilities as well as the financial and human resources available to the Knights of St. John. For 200 years the knights strengthened the walls by thickening them, up to 40 feet in places, and curving them so as to deflect cannonballs. The moat between the inner and outer walls never contained water; it was a device to prevent invaders from constructing siege towers. You can get a sense of the enclosed city's massive scale by walking for free inside the moat; entrances can be found at the gates of St. Athanasius and Ambroise.

Part of the walkway that runs the 4 km (2½ miles) along the top of the walls is accessible through the Palace of the Grand Master ticket office; free tours are run daily between noon and 3 pm.

This circular fortress, built by the Knights of St. John in the 15th century, guards the entrance to Mandraki Harbor, near a row of picturesque but disused windmills.