May 8, 1945: Berlin is divided into 4 sectors: the American, British, French in the West and the Soviet in the East.
June 24, 1948 – May 12, 1949: Soviet blockade of Berlin’s western sectors.
Summer 1952: the border (Interzonengrenze) between East and West Germany is closed, only the border in Berlin remains open.
August 13, 1961: the Berlin sectorial borders are closed, barriers are build.
August 14, 1961: Brandenburg Gate is closed.
August 26, 1961: all crossing points are closed for West Berlin citizens.
December 17, 1963: West Berlin citizens are again allowed to visit East Berlin.
September 3, 1971: Four Power’s Agreement over Berlin; visiting becomes easier for West Berliners
September 10, 1989: Hungarian government opens border for Ease German refugees.
November 9, 1989: Berlin Wall is opened.
December 22, 1989: Brandenburg Gate is opened.
total length: 155 km
number of watch towers: 302
number of bunkers: 20
persons who succeeded in passing the wall: ~5000
persons arrested in the border area: ~3200
persons killed in the border area: ~160