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Dominating the skyline of the city is the Prague Castle the largest ancient castle in the world. Over the centuries the castle has survived many invasions, fires and wars, and has been rebuilt many times, which has resulted in a mixture of architectural styles. The castle is currently the seat of the president of the Czech Republic, and each hour, on the hour, the changing of the guard takes place. If you catch it at midday, you can see the military fanfare, too. You will need at least half a day to explore the castle, its courtyards, surrounding churches and beautiful gardens, whilst taking in all the history. Make sure you finish off your visit with lunch in one of the surrounding cafes or restaurants.