Although Sweden maintained neutrality during WWII, evidence of the war can still be detected in the country. Plans were made and defense lines were erected in preparation for a potential invasion. Northern Djurgården is one example as it was part of Stockholm's inner H-line (main defense line). There was also an outer main defense line called the "korvlinjen" (sausage line). The line through Norra Djurgården was built during World War II and included tank obstacles, bunkers, shelters, and artillery positions in a line from Brunnsviken in the west, past Laduviken to Husarviken in the east, a distance of just under three kilometers. Most of the structures that once comprised this defensive line have since been dismantled. However, you can still find massive square-pyramidal blocks of fortified concrete covered in moss scattered about the terrain. These structures, also known as dragon’s teeth, were placed here along the ridge to slow down any enemy armor - tanks and amechanised infantry - attempting to close in on Stockholm from the north.
