Prague has evolved into its present form for eleven centuries. As a historical metropolis, it was the capital of the Czech Principality, the Czech Kingdom and the seat of the emperors of the Holy Roman Empire. The city played an important role in the Czech and Protestant Reformation, in the Thirty Years` War and in the history of the 20th century as the capital of Czechoslovakia, both during the two world wars and in the post-communist era. Prague is home to a number of famous cultural attractions, many of which survived the devastating period of 20th century Europe. The main attractions include Prague Castle, Charles Bridge, Old Town Square with the Prague Astronomical Clock, Josefov, PetÃ
â¢ÃÂn and VyÃ
¡ehrad. Since 1992, the historical center of Prague has been a UNESCO World Heritage Site.
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