Castillo de Macenas, Watchtower on Macenas beach, Mojácar, Spain

Castillo de Macenas is an 18th-century horseshoe-shaped watchtower on Macenas beach, south of Mojácar near the road to Carboneras. Its vaulted interior has three levels: a powder magazine and stores below, a kitchen and living room in the middle, and a rooftop terrace where two 24-pound cannons stood at barbette, with a loopholed parapet facing inland.

The tower was built in the second half of the 18th century as a coastal watchtower, not a medieval fortress. Felipe de Paz reported in 1803 that it held two 24-pound cannons. By 1830 it was disarmed and guarded by a corporal and three watchmen; in 1873 a carabiniers' barracks stood beside it. It was used again during the Spanish Civil War, when a ground-floor door was added.

Locals call it both tower and castle, though it is a small 18th-century watchtower. Its name comes from the Macenas beach where it stands, south of Mojácar near the road to Carboneras. The 1873 carabiniers' barracks beside it shows the site later served as a coastal guard post.

The tower stands on Macenas beach beside the road from Mojácar to Carboneras. Only the exterior is open, with free access and no staff or guides on site. The original entrance was raised and reached by rope ladder; the ground-level door visible today was cut during the Spanish Civil War.

The tower's lower door was cut into the wall during the Spanish Civil War and still stands today; the original entrance was a raised doorway reached by rope ladder. The site carries code AL-CAS-140 in Andalusia's castle register and was among the castles recognised by the Junta de Andalucía in 1993.