The German troops occupying Schiermonnikoog during WWII totalled some 600 men. They built bunkers in the dunes along the beach as part of the Atlantic Wall to defend against allied forces. There was even a whole village at the end of the Prins Bernhardweg, consisting of bunkers, radar installations, anti-aircraft batteries and camouflaged barracks.
This bunker contained the ammunition for the anti-aircraft weapons. You can still see the original camouflaging on the outside walls.
There are information panels in the bunker.