The Alcazaba, also known as the Muralla del Castillo, stands as the last remains of Marbella's old Moorish castle and its impressive fortifications, which once surrounded the town. 

This castle fortress is an important relic of the Muslim civilization of Marbella, and two defensive towers still stand. Within the building are embedded Roman capitals repurposed from ancient buildings.

The defense walls date to the 10th and 11th centuries. The towers and other remnants of the building are also from the Moorish Caliphal period (from the 10th to the 11th centuries). Tourists can also attend outdoor concerts and cultural events held here during summer.