Prague Castle, located on the hills of the Voltava River in Czech Republic, is the largest ancient castle in the world. The castle is one of Prague's most attractive tourist attractions, which gathers the artistic essence of various historical periods. In the ninth century, Prague's Prince first built a castle on the mountain of Voltava. Since then, he has ruled over his Czech people and land. He has been the seat of the Prague Royal family. After several centuries of expansion, he has not only retained many magnificent buildings and historical relics, but is still the residence of the Czech President. Standing on the castle, you can see the whole city of Prague.