Valkenburg Castle is a historic castle located in Valkenburg aan de Geul, a town in the Netherlands. Built in the 11th century, it is one of the oldest castles in the country. The castle is situated on a hill, offering stunning views of the surrounding landscape and the Geul River. The castle has a rich history, having served various purposes over the centuries, including as a fortress and a residence. Today, visitors can explore its ruins, which include impressive walls and towers, and learn about its significance in Dutch history through informative displays.