Karlštejn Castle is a large Gothic castle. It was built in the 14th century by Emperor Charles IV as a place to store the Bohemian Crown Jewels and other important documents.
The castle is one of the most popular tourist destinations in the Czech Republic. It is known for its beautiful architecture, its rich history, and its interesting exhibits.
The castle was built in three stages between 1348 and 1365. The first stage was the construction of the Lower Castle, which was used as a residence for the royal family. The second stage was the construction of the Middle Castle, which was used as a treasury and a place to store the Bohemian Crown Jewels. The third stage was the construction of the Upper Castle, which was used as a place of worship.
The castle was used by the Bohemian kings and emperors to protect the Bohemian Crown Jewels from invaders until the 16th century, when the jewels were moved to Prague Castle, but the castle still houses a collection of religious artifacts, including a number of gold and silver vessels.