Brandenburg Gate behind border wall and barbed wire, Berlin, ca. 1962 - Historical source: Stiftung Berliner Mauer (F-030742), photo: unknown, CC BY-NC-SA 4.0
Border soldiers guarding the unfinished Wall in Sebastianstraße, Berlin, August 15, 1961 - Historical source: Stiftung Berliner Mauer (F-023710), photo: Günter Ohlendorf, CC BY-NC-SA 4.0
Lettering on the border wall 75 at the corner of Zimmerstraße/Charlottenstraße, Berlin, August 31, 1979 - Historical source: Stiftung Berliner Mauer (F-015416), photo: Edmund Kasperski, CC BY-NC-SA 4.0
Viewing platform on Elsenstrasse, Berlin, 1974 - Historical source: Stiftung Berliner Mauer (F-021073), photo: Hans-Joachim Grimm, CC BY-NC-SA 4.0
Filling the concrete segments during the construction of the border wall 75 at Zimmerstraße, Berlin, October 4, 1976 - Historical source: Stiftung Berliner Mauer (F-015006), photo: Edmund Kasperski, CC BY-NC-SA 4.0
Viewing platforms at the border wall on the Lohmühlenbrücke, Berlin, 1962 - Historical source: Stiftung Berliner Mauer (F-021818), photo: private, CC BY-NC-SA 4.0
Concrete composite and concrete layer wall in front of the Berlin House of Representatives, Berlin, 1971 - Historical source: Stiftung Berliner Mauer (F-021403), photo: Albrecht Roos, CC BY-NC-SA 4.0
Berlin Wall with border house and watchtower at Lohmühlenbrücke, Berlin, May 1986 - Historical source: Stiftung Berliner Mauer (F-021058), photo: Hans-Joachim Grimm, CC BY-NC-SA 4.0
Concrete wall near Reichstag at Friedrich-Ebert-Platz - Historical source: Stiftung Berliner Mauer (F-021395), photo: Albrecht Roos, CC BY-NC-SA 4.0
Visitors to the Wall during the construction of Border Wall 75 at Potsdamer Platz, Berlin, April 1976 - Historical source: Stiftung Berliner Mauer (F-022750), photo: Detlef Machmüller, CC BY-NC-SA 4.0
Border wall 75 south of the Brandenburg Gate, Berlin, 1989 - Historical source: Stiftung Berliner Mauer (F-023363), photo: Detlef Gallinge, CC BY-NC-SA 4.0