The Danish part of the Atlantic Wall was a coastal defense line along the west coast of Jutland, which was built during WWII. It consisted of about 8.000 different concrete constructions of which roughly 2.000 were bunkers.  

In some areas, the bunkers have been removed or covered up, and in other places sand migration has erased the traces of the bunkers. However, the larger part of the bunkers remain almost unchanged since the war.

Courtesy the Hvide Sande website.

This is photos from my trip to Skagen. See the full series on my Flickr album.