Historic Centre of Àger Monument · Àger, Noguera, Lleida Medieval walled precinct crowning the promontory of Àger alongside the castle and the collegiate church of Sant Pere, with which it forms a single complex declared a Bien de Interés Cultural (Spain's top heritage-protection category); it preserves stretches of wall and part of its original urban layout. Photo: Isidre blanc (CC BY-SA 4.0) What to see and do in Àger