In 1933, in one of the districts of Königsberg - Siewiernaja Gora - the Germans established one of the first Nazi concentration camps - Quednau.

An excerpt from the article 24 facts about Kaliningrad

It was built in the outer Fort III of the royal fortress - Fort Quednau, built in the 1870s, later named König Friedrich III.

During the siege of the city during World War II, the fort was defended by the Germans until April 7, 1945.

In 1999, a significant part of the archaeological collections of the pre-war Prussia-Museum were found in the fort.