Castle of Coll de Som Monument · Benifallet, Baix Ebre, Tarragona Image of Benifallet, not of the place itself. The Coll de Som castle crowns the highest point of the pass of the same name, at 251 metres, with a broad view of the Ebro valley over the Xerta-Tivenys weir. It is already mentioned in 1158 as the boundary of a donation to Tortosa cathedral, and some authors place here the old medieval town of Som. Today only walls of plain rendered masonry remain standing, with some ashlar blocks at the bases and corners, forming a small, narrow enclosure opened by loopholes; access is difficult, with no path or trail. The visible ruins correspond to observation posts built during the 19th-century Carlist Wars and the Civil War. It is declared a cultural asset of national interest. Photo: Viquipèdia (CC BY-SA 4.0) What to see and do in Benifallet