Fodor's Expert Review Tre Castelli
San Marino's headline attractions are its Tre Castelli—medieval architectural wonders that appear on every coat of arms in the city—and some spectacular views. Starting in the center of town, walk a few hundred yards past the trinket shops, along a paved clifftop ridge, from the 10th-century Rocca della Guaita to the 13th-century Rocca della Cesta (containing a museum of ancient weapons; worthwhile mostly for the views from its terraces and turrets) and finally to the 14th-century Rocca Montale (closed to the public), the most remote of the castles. Every step of the way affords spectacular views of Romagna and the Adriatic—it's said that on a clear day you can see Croatia. The walk makes for a good day's exercise, but is by no means arduous. Even if you arrive after visiting hours, it's supremely rewarding.