Horno Alto n.º 1 de Sestao Monument · Sestao, Bilbo Handia / Gran Bilbao, Bizkaia Blast furnace put into operation in 1959 and shut down for good in 1995; it was declared a bien cultural (cultural asset) in 2005 as a testament to the industrial past of the Bilbao estuary. 1959 (puesta en marcha); 1995 (apagado); 2005 (declaración de bien cultural) Photo: Josu P (CC BY 2.5) What to see and do in Sestao