Castillo de Bellver is a circular castle located on a hill overlooking Palma, the capital of Mallorca, Spain. Built in the 14th century, it was commissioned by King James II of Mallorca as a royal residence. The castle features a unique circular design, which is rare for fortifications in Europe, and includes three towers and a central courtyard. Today, Castillo de Bellver serves as a museum and offers stunning panoramic views of the surrounding area, including the Bay of Palma. It is a popular tourist attraction, showcasing the rich history and architecture of the Balearic Islands.