"To commemorate the 20th anniversary of the fall of the Berlin Wall, Twinity has reconstructed a true-to-scale section of the wall in virtual Berlin.

Walk through one of the open-air wall museum gateways at the Brandenburg Gate, Potsdamer Platz, Checkpoint Charlie, and four other locations in Twinity and step back in time to 1989. From the Brandenburg Gate to Checkpoint Charlie - a 2 km, interactive stretch of the Berlin Wall including the infamous death strip will appear before your eyes.

Background information on the history of the GDR, from the building of the wall to German reunification, can be found at key points along the way."

s. a. http://geschichtsunterricht.wordpress.com/2011/01/12/3d-reise-ins-berlin-von-1989/