Tower of el Molinete Monument · Mazarrón, Bajo Guadalentín, Murcia Image of Mazarrón, not of the place itself. Circular watchtower in Mazarrón built in 1490 by the Catholic Monarchs against Berber raids, one of the oldest structures in the municipality's coastal surveillance system. It stands next to the Castillo de los Vélez, is built of rubble masonry and was declared a Bien de Interés Cultural (Spain's highest level of heritage protection) in 2007. Photo: Pedro J Pacheco (CC BY-SA 3.0 es) What to see and do in Mazarrón