Ridge of the Towers Monument · Martorell, Baix Llobregat, Barcelona Also called the Torre Grimenella, it is a rectangular watchtower from the late Middle Ages, perhaps from the second half of the 13th century, on the Serra de les Torretes; Martorell is documented since 1033, and the barony was held by the Montcada family between 1228 and 1309, until King Martin the Humane incorporated it into the crown in 1396. Photo: Pere López (CC BY-SA 3.0) What to see and do in Martorell