Sa Torreta de Tramuntana (taula)

A taula (meaning table in Catalan) is a T-shaped stone monument found on the Balearic island of Minorca. Taulas can be up to 3.7 metres high and consist of a vertical pillar (a monolith or several smaller stones on top of each other) with a horizontal stone lying on it. A U-shaped wall often encloses the structure.

http://en.wikipedia.org/wiki/Taula