Site of the infamous January 1942 conference in suburban Berlin dealing with Final Solution to the Jewish Question, i.e. deport jews to Poland and murder them. No decisions were expected nor made at the conference, as the "Final Solution" was already decided on and in progress. The sole purpose was to promulgate the Nazi program to ministers and other high government officials; and secure their cooperation. There is a 1984 documentary: "Die Wannseekonferenz" (with English sub-titles). For further information: Link.