The Adolf Cannon is a museum in Harstad that houses one of the largest battleship cannons in Europe, dating from World War II. The cannons are unique, as they are the only ones in the world that can still be viewed in their entirety. They formed the most powerful battery in Hitler's Atlantic Wall, and represent an important part of the history of war.
Visitors can take part in guided tours, which must be booked in advance. The availability of these tours depends on the number of people registered. Private tours are also available on request. Visitors meet at a clearly marked location before the main gate of Trondenes camp.