The Towers of Cas Monument · Àger, Noguera, Lleida Image of Àger, not of the place itself. Christian watchtowers from the 11th and 12th centuries, in the settlement of Fontdepou, within the municipal district of Àger; they were part of the surveillance network that protected the Vall d'Àger after the Christian conquest. Photo: jordi domènech (CC BY-SA 3.0) What to see and do in Àger