The following map - a photo I have taken of a map on a wall near Checkpoint Charlie - this shows where the BERLIN WALL divided east and west. Note the red line to the left and along the bottom of the image.
August 12/13, 1961
In the afternoon of August 12 at 4 p.m. Walter Ulbricht, the East German leader, signed the commands to close the border. Next Sunday at midnight the army, police and the "Kampfgruppen" began to bolt the city. The wall is built and separates the city into two parts for more than 28 years.
Streets, the railway and the S-Bahn (city railway) are broken, stations of the U-Bahn (underground railway) are closed, even cemeteries are not spared. Nothing is forgotten and the East Germans will not be allowed to free travel to the West until 1989.
The following images of Checkpoint Charlie were taken when I was in Berlin this month (December 2009) ...
Soon the US military police opened the third checkpoint at Friedrichstrasse. The other two checkpoints were Helmstedt at the West German-East German border and Dreilinden at the West Berlin and East Germany border. Based on the phonetic alphabet the Helmstedt checkpoint was called Alpha, Dreilinden Checkpoint Bravo and the checkpoint at Friedrichstrasse got the name Charlie.
The main function of the checkpoint was to register and inform members of the Western Military Forces before entering East Berlin. Foreign tourists were also informed but not checked in the West.
The German authorities in West and East Berlin were not allowed to check any members of the Allied Military Forces in Berlin and in Germany.