Prague Castle (Czech: Pražský hrad), Prague, Czech Republic.
It is the official residence and office of the President of the Czech Republic. Located in the Hradčany district of Prague and dating back to the ninth century, the castle has been a seat of power for kings of Bohemia, Holy Roman emperors, and presidents of Czechoslovakia. The Bohemian Crown Jewels are kept within a hidden room inside it. The Guinness Book of Records lists Prague Castle as the largest ancient castle in the world. It occupies an area of almost 70,000 m2, at about 570 meters in length and an average of about 130 meters wide. Prague Castle includes Gothic St Vitus Cathedral, Romanesque Basilica of St. George, a monastery and several palaces, gardens and defense towers. Most of the castle areas are open to tourists.
Petřín Tower Prague 50.089599714 14.430356371