Prague Castle (Czech: Pražský hrad) is a castle in Prague where the Czech kings, Holy Roman Emperors and presidents of Czechoslovakia and the Czech Republic have had their offices. The Czech Crown Jewels are kept here. Prague Castle is one of the biggest castles in the world (according to Guinness Book of Records the biggest ancient castle) at about 570 meters in length and an average of about 130 meters wide. The history of the castle stretches back to the 9th century (870).

The first walled building was the church of Our Lady. The Basilica of Saint George and the Basilica of St. Vitus were founded in the first half of the 10th century. The first convent in Bohemia was founded in the castle, next to the church of St. George. A Romanesque palace was erected here during the 12th century. In the 14th century, under the reign of Charles IV the royal palace was rebuilt in Gothic style and the castle fortifications were strengthened. In place of rotunda and basilica of St. Vitus began building of a vast Gothic church, that have been completed almost six centuries later. During the Hussite Wars and the following decades the Castle was not inhabited. In 1485 King Ladislaus II Jagello begins to rebuild the castle.