Hitler’s Cannon in Norway – The Monster of Trondenes 🇳🇴 The Adolf Gun at Trondenes is the last of its kind in the world—fully preserved with its original gun turret, ammunition tunnels, and bunker complex. Today, it is regarded as the largest preserved land-based artillery piece of the Second World War. On the coast near Harstad, deep in northern Norway, stands one of the most colossal relics of WWII: the Adolf Gun. Constructed in 1943 as part of the Atlantic Wall, it featured a caliber of 40.