Bernauer Straße had marked the border between the French and Soviet sectors of Berlin since 1945. With the building of the Wall in August 1961, the street was divided in half: one side belonged to West Berlin, the other to East Berlin (with the walls of the houses on the Eastern/Soviet side actually forming part of the border fortification.) In this photo, stunned residents watch the construction from the Western side of Bernauer Straße. Photo by Klaus Lehnartz.