Prague - Czech Republik
Within the walls of Prague Castle (Pražský hrad), one of the most important UNESCO World Heritage Sites in the Czech Republic, are some of the city's most visited attractions. In addition to the old fortifications, tourists can view old cathedrals and churches, historic towers and gatehouses, as well as splendid royal palaces and their gardens. Once home to Bohemian kings and now the official presidential residence, the castle has changed a great deal since its establishment in the 10th century and contains many different architectural styles. Acknowledged by the Guinness Book of Records as the largest ancient castle in the world - it measures 570 meters in length and averages 130 meters in width - Prague castle can take a fair amount of time to visit, and its sheer size is intimidating.