Karlštejn Castle is a historic fortress located about 30 kilometers southwest of Prague, Czech Republic. Built in the 14th century by Charles IV, the castle served as a royal residence and a place to store the crown jewels and other important relics. Its strategic position on a hill offers stunning views of the surrounding countryside. The castle features a unique Gothic architectural style, characterized by its tall towers and fortified walls. Visitors can explore various parts of the castle, including the impressive Great Tower, which houses the Chapel of the Holy Cross, adorned with beautiful frescoes and valuable artifacts.