Ksiaz Castle, also known as Schloss Fürstenstein in German, is a castle located in the Lower Silesian Voivodeship of southwestern Poland. It is one of the largest castles in the region and is situated on a rocky hill overlooking the Pelcznica River.

The castle was first built in the 13th century, but it underwent many changes throughout the centuries, including expansions and reconstructions. It was originally a defensive stronghold, but in the 16th century, it became a residence for the dukes of the House of Hochberg.

During World War II, the castle was taken over by the Nazis and used as a headquarters for the Gestapo. After the war, it became state property and was used as a sanatorium and a rehabilitation center for the blind.

Today, Ksiaz Castle is a popular tourist attraction and is open to the public for guided tours. Visitors can explore the castle's impressive architecture, including its Gothic, Baroque, and Rococo elements. The castle's interior is also adorned with valuable works of art, antique furniture, and decorative elements.

The castle's park and gardens are also worth a visit, as they contain numerous walking paths, water features, and sculptures. Additionally, the castle hosts cultural events and concerts throughout the year, making it a lively destination for visitors of all ages.