This 15th-century octagonal fortress is part of the palace of Sotomayor. It has an unusual square base that turns into an octagon as it goes up and smaller cylindrical towers on each of its eight angles. The towers have a “basketweave” pattern on the bottom and a shield midway.

The Torre del Clavero currently houses the offices of the Salamanca Provincial Government and often hosts art exhibitions in addition to its permanent pharmaceutical exhibition.