Son Jaumell, Medieval watchtower in Capdepera, Spain

Son Jaumell is a ruined round watchtower on the summit of Es Telégraf, a 271-metre hill in the Capdepera municipality of Mallorca. Originally about 9 metres high and built in the 16th century, only parts of its outer wall remain. The tower's name is sometimes used for the mountain itself.

The round tower was built in the 16th century, originally about 9 metres high, as a watch and signal tower within a warning system against pirate raids. When an enemy ship was sighted, the guard lit a fire — fresh wood by day for smoke, dry wood by night for visible flames — alerting the neighbouring towers and the hinterland, where bells called men to defend. Only parts of the outer wall survive.

The name Son Jaumell probably derives from Jaume II, who founded nearby Capdepera in 1300. When a hostile ship appeared, the watchman lit fresh wood by day for smoke and dry wood by night for flames, alerting the next towers in sight; inland, bells called men to defend.

The tower stands on the 271-metre summit of Es Telégraf, reached by narrow, well-trodden paths from Cala Mesquida and Cala Agulla. The climb is unsuitable for visitors with mobility problems, so wear hiking boots and carry water and food.

The name Son Jaumell probably derives from Jaume II, who founded nearby Capdepera in 1300. The tower also gives its name to the 271-metre hill, Es Telégraf, on whose summit it stands. Only parts of the outer wall of the roughly 9-metre round tower survive.