Zvikov castle, also known as the "King of Czech Castles", is a medieval fortress located in the Czech Republic. It is situated on a rocky promontory above the confluence of the Vltava and Otava rivers, in the southern part of Bohemia.

The castle was originally built in the 13th century as a strategic defense against invading armies, and it played an important role in the Hussite Wars and the Thirty Years' War. Over the centuries, it was expanded and rebuilt several times, with each new ruler adding their own architectural style and design to the castle.

The most significant addition to the castle was made in the 16th century, when a Renaissance palace was built on the site. This palace features beautiful frescoes, ornate stucco decorations, and intricate woodcarvings. Visitors to the castle can explore the palace, as well as the castle's dungeons and towers, which offer stunning views of the surrounding countryside.

Today, Zvikov castle is a popular tourist attraction, and it is open to the public for tours. Visitors can also attend a variety of cultural events, including medieval reenactments, concerts, and festivals, which are held at the castle throughout the year.