Torres d’Enfilació, Bay of Alcudia

Walking in the north east of Mallorca, in the Bay of Alcúdia, between Port d’Alcúdia and Colònia de Sant Pere, you will find quite a number of strange-looking, obelisk-shaped towers. These Torres d’Enfilació (towers for aiming) always come in pairs; some of them have recently been repaired by the Ministeri de Medi Ambient and painted in a stark design using white and red colour.The towers, 28 remaining, were placed at equal distances of 1240 m from pair to pair. There are the larger ones with balcony and then the smaller ones.They were built by the Spanish military’s Naval division just after the Spanish Guerra Civil for triangulation purposes used for aiming and targeting practices of submarines. Submarines were stationed in Mallorca and in the Alcúdia Bay as part of the Polígon d’Armes Submarines which operated between 1941 and 1970. Nearby, there still is the Naval airport of Port de Pollença.
http://de.wikipedia.org/wiki/Peilturm
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