Kalixlinjen, Working life museum and fortified line in Kalix Municipality, Sweden.

Kalixlinjen is a defensive zone between the Torne and Kalix rivers, not a line at the rivers themselves. It consists of numerous concrete casemates, shelters and smaller fortifications. From the 1960s, artillery forts were added, armed with 15.2 cm guns from HMS Gustav V and HMS Fylgia and 12 cm guns from destroyers. Two forts remain, at Siknäs and Kamlunge.

The line was built during World War II to defend Sweden's northern territory and stayed in service until the 1990s as part of Cold War planning. Over those decades, it was updated and expanded to meet changing military expectations along the eastern border.

The museum reflects how locals adapted their daily routines and work around the presence of military defenses in their landscape. It shows the human side of living near constant fortifications during wartime.

The sites are open year-round, but snow and ice in winter can make some paths harder to walk. Since the fortifications cover a large area, it helps to wear sturdy footwear and allow plenty of time for moving between locations.

Along the roads crossing the defense zone, engineers built explosive chambers designed to blow up the routes if enemy forces advanced. These chambers were hidden inside ordinary road structures, making them nearly invisible to anyone who did not know they were there.