History of Berlin to intervene. In 1968 and after, West Berlin became one of the centers of the student revolt; in particular, the Kreuzberg borough was the center of many riots. The Fall of the Berlin Wall in November 1989 marks the end of the Cold War. On 9 November 1989, border guards allowed crowds from East Berlin to cross the frontier at the Bösebrücke. The guards believed that the authorities had decided to open the wall, but in reality no firm decision was taken and events gathered steam on their own. People of East and West Berlin climbed up and danced on
Berlin Wall Day. On 9 November 2009, Berlin celebrated the 20th Anniversary of the Fall of the Berlin Wall with a "Festival of Freedom" with dignitaries from around the world in attendance for an evening celebration around the Brandenburg Gate. A high point was when over 1,000 colourfully designed foam domino tiles, each over tall, that were stacked along the former route of the Wall in the city center were toppled in stages, converging in front of the Brandenburg Gate. A Berlin Twitter Wall was set up to allow Twitter users to post messages commemorating the 20th anniversary. The Chinese government quickly