This surveillance tower was build at the end of XVIII century, it's located in Son Ganxo at the south of the island of Menorca. Ramon Santander was the military engineer who designed it. It has three levels, and has been rehabilitated. Nowadays it's property belongs to the Insular Council of Menorca.

http://ca.wikipedia.org/wiki/Torre_de_defensa_costanera_de_Punta_Prima