Cave of els Vilasos o dels Vilars Nature · Os de Balaguer, Noguera, Lleida Small rock shelter —11.60 metres wide, 8 deep and about 3.5 high— located in the barranc dels Vilars, in the Os mountain range, in the municipality of Os de Balaguer. It preserves rock art in two areas: the left-hand band, with 29 motifs including quadrupeds, human figures, concentric circles and a doe, and another near the entrance. The styles range from schematic to naturalistic, with colours from black to red and orange, pointing to different periods of execution, generally placed in the Bronze Age (1800-650 BC). It forms part of the World Heritage Rock Art of the Mediterranean Basin, near the depopulated village of Tragó de Noguera, incorporated into the municipality in 1964 following the Canelles and Santa Anna reservoirs. Photo: Clemens Schmillen (CC BY-SA 4.0) What to see and do in Os de Balaguer