This southwestern castle city is one of the country's finest medieval sites. Its Old Town is a UNESCO-designated World Heritage Site, a maze of twisting alleys built around the extensive Cesky Krumlov castle. The castle's 18th-century court theater is one of the few such marvels in existence. Saunter through crooked, cobblestone streets on foot and soak up the atmosphere of this impeccably preserved medieval gem. The gushing Vltava, popular with rafting enthusiasts, darts through the town.