Walls of Oliana Monument · Oliana, Alt Urgell, Lleida The old core of Oliana climbs a hill where the walled town was concentrated, whose walls partly coincided with those of the castle; stretches of wall and entrance arches survive, such as the Portalet, a former covered entrance, and the Plaça del Lledoner, resting on the wall itself. Photo: PMRMaeyaert (CC BY-SA 3.0) What to see and do in Oliana