In the Old Royal Palace there are not only parts which can be visited every day, such as the Vladislav Hall, but it conceals much older areas as well. One such place is the whole Romanesque floor from the 12th century when the palace was founded by prince Soběslav I. The dominant feature of the whole floor is a hall with a high vaulted ceiling. It breathes with the atmosphere of spectacular feasts of the Middle Ages, however, its use was probably less grand. It could have served as storage or later as a prison. On the Romanesque floor there is also a fortification tower from the 12th century and remains of the very first defence rampart of the 10th century. In addition to that, the lowest floor of the palace also conceals the spot where the Czech Crown Jewels were hidden during World War II.