German officials supervise construction of the Berlin Wall
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Berlin marks 50 years since the building of the Wall

13 August 2011 Last updated at 11:55 BST

The German Chancellor Angela Merkel is attending ceremonies to mark 50 years since the building of the Berlin Wall.

The event will take place on Bernauer Strasse - a street which was split down the middle by the wall which separated the east and west of the city.

The BBC's Stephen Evans spoke to West Berliner Klaus-Michael Keussler, and East Berliner Wolf Kuhnelt who remember the structure being built.

Archive video courtesy British Pathe