This sight is a set of tunnels built underneath Barcelona during the civil war in 1937. It was initially used to provide shelter to poor migrant families. The 30-minute tour will take you through area 307’s web of tunnels, giving you an insight into bathrooms, infirmaries, and other rooms, and a better idea of how some people had to live in those days. Opening hours: Saturday and Sunday, 11 a.m. to 2 p.m., Monday through Saturday: groups with reservations only Tours: Sundays, tours at 10.30 a.m., 11.30 a.m., and 12.30 p.m. (reservations only); Monday through Saturday: groups with reservations only. Reserve your tour by calling +34 932562122 or via mail.