The name of the village comes from the Arabic القصر al qaçr for "fort" or "castle" (renamed as Alcazar in Spanish). The castle became the main defense point of the nearby city of Barbastro.
The surrounding area to the south towards Barbastro, in the direction of the flatter Ebro basin, is part of the Somontano, an area known for its fine wines. There are more than 60 limestone caves with prehistoric cave paintings in the surrounding area, which has led to the region being declared a World Heritage Site by UNESCO in 1998. A good example is the cave at Arpán on the A-2205 road heading north towards Bárcabo.
Gallery
View of Saint Michael's church from the Collegiate church