You needn't be religious to appreciate the calming atmosphere of Huesca Cathedral. Look up when the next service starts or when you can go for a wander through.
This principal church is situated in Casco Antiguo, a place that has so much going for it! El Alcoraz Stadium, Abbey of San Pedro el Viejo, and Espacio 042 are other popular sightseeing choices not far away when you've had your fill of Huesca Cathedral.