El Castell de Bellver, located in Palma de Mallorca, Spain, is a 14th-century Gothic fortress built for King James II of Mallorca. It is noted for its round shape, unique in style in Spain. Situated on a hill, it offers spectacular views of the city and the bay of Palma. Throughout the centuries, it has served as a royal residence and military prison. Today, it houses the Museum of History of Palma and is an important historical and cultural symbol of the island.