Marianne Birthler, Federal Commissioner for the Stasi Records, Nobel Prize winner and managing director of Grameen Bank, Muhammad Yunus, Berlin Mayor Klaus Wowereit and former Soviet Union President Mikhail Gorbachev (L-R) pose for a group picture before a news conference in the Berlin City Hall November 9, 2009. As the highlight of a 5-million euro ($7.4 million) celebration marking the 20th anniversary of the fall of the Berlin Wall on November 9, a 1.5-km (one-mile) long segment of the Wall will stand for two days along its original route in front of the Brandenburg Gate to the Potsdamer Platz. The row of 1,000 20-kg dominos standing 1.5 metres apart -- painted in bright colours by school children and rising 2.5 metres high -- will be toppled at the end of a gala ceremony as a symbolic tribute to the collapse of the Wall 20 years earlier. Reuters Pictures 1 week ago

Marianne Birthler, Federal Commissioner for the Stasi Records, Nobel Prize winner and managing director of Grameen Bank, Muhammad Yunus, Berlin Mayor Klaus Wowereit and former Soviet Union President Mikhail Gorbachev (L-R) pose for a group picture before a news conference in the Berlin City Hall November 9, 2009. As the highlight of a 5-million euro ($7.4 million) celebration marking the 20th anniversary of the fall of the Berlin Wall on November 9, a 1.5-km (one-mile) long segment of the Wall will stand for two days along its original route in front of the Brandenburg Gate to the Potsdamer Platz. The row of 1,000 20-kg dominos standing 1.5 metres apart -- painted in bright colours by school children and rising 2.5 metres high -- will be toppled at the end of a gala ceremony as a symbolic tribute to the collapse of the Wall 20 years earlier.