 Through this, and the new zoning guidelines of the 1960s, the inner city lost much of its architectural past.From 1938 until 1945 a concentration camp was established in the Neuengamme quarter of Hamburg, the Neuengamme concentration camp, some of the buildings have been preserved and as of 2008 serve as a memorial.From 1939 until 1945 more than 500,000 men, women and children — including prisoners of war — were forced to work at more than 900 companies, living in more than 1,200 camps all over Hamburg.