Festungsmuseum Sperre Trin

Festungsmuseum Sperre Trin is a fortress museum in Trin, Graubünden, Switzerland, presenting bunkers and rock caverns built in 1942 and the modern 12cm fortress mortar of 1988 that formed the secret 1205 Sperrstelle Trin. The volunteer-run site offers two different tours through the formerly top-secret installations and a "Bunker Way" educational route.