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A hand reaches above the broken glass-covered top of the Berlin Wall in August 1961.

A West German man lifts his son to give him a view of the other side of the Berlin Wall, 1961.

A woman, foreground, who had escaped to West Berlin, speaks to her mother — who is still in East Berlin — in August 1961.

A West Berlin woman looks out over the Berlin Wall — reflected in her window — in 1961.

American forces, in foreground, face East German forces across the newly built Berlin Wall in 1961.

A crowd of West Berlin residents watches as an East German policeman patrols the Berlin Wall in August 1961.

An East German mason builds up a fresh portion of the Berlin Wall in August 1961.

A crowd of West Berlin youths gather to protest the construction of the Berlin Wall in August 1961.

Sunlight shines on the barbed wire and blocks of the Berlin Wall in August 1961.

An East German policeman uses sunlight reflected off a mirror in an attempt to stop photographers from taking pictures in August 1961.

A West Berlin toddler attempts to open a sealed door of a house that has become part of the Berlin Wall in August 1961.

West Berlin children, from left, Peter Friedrich, 5, Katrin Kuhl, 4, and Jurgen Bottcher, 8, build a pretend Berlin Wall in a vacant lot.

Three West Berlin police officers jump off a truck as two others run to meet them before starting their shifts on guard duty at the Berlin Wall.

West German police look out over the Berlin Wall in order to offer their help to any potential escapees to the West in October 1961.

(1 of 2) An East German teen makes his way to the West climbing over the Berlin Wall in October 1961.

(2 of 2) He is helped by west Berlin police to slip over the wall.

Birds on barbed wire strung atop the Berlin Wall in January 1962.

A young West German, Monika Heyne, plays with a ball near the Berlin Wall in January 1962.

An East German guard throws a ball back to a child on the West German side of the Berlin Wall.

An East German policeman, known as a Volkspolizei or "people's police" — Vopo for short — walks at Checkpoint Charlie between East and West Berlin.

Children chase a ball beside the Berlin Wall in December 1962.

A girl looks at the Berlin Wall through a frosty window which reflects the Wall's silhouetted barbed wire in December 1962.

The Berlin Wall bears the shadowy silhouettes of West Berliners waving to their relatives on the unseen, Eastern side of the Wall in December 1962.

A divided Berlin, seen through a tangle of barbed wire in December 1962.