People watch the fireworks display in front of the Brandenburg Gate in Berlin on November 9, 2009 during the celebrations marking the 20th anniversary of the fall of the Berlin Wall. (AFP)

Dominos stand at Brandenburg Gate along the former route of the wall in Berlin on November 9, 2009, as part of the celebrations marking the 20th anniversary of the fall of the Berlin Wall. Some 1,000 giant dominos, many of them decorated by schoolchildren, will be toppled during the official ceremony in Berlin on November 9, 2009, the day of the commemoration of the 20th anniversary of the fall of the wall. (AFP)

Dominos placed along the former border in front of the Brandenburg Gate fall in a symbolic act in Berlin, Germany, Monday, November 9, 2009, during the commemorations of the 20th anniversary of the fall of the Berlin Wall on November 9, 1989. (AP)

Fireworks explode over the Brandenburg Gate in central Berlin at the end of the official ceremony to mark the anniversary of the reunificiation of Germany, on November 9, 2009. Germany is celebrating the 20th anniversary of the fall of the Berlin Wall on November 9, 2009 with many world leaders coming to Berlin to mark the event. (AFP)

Fireworks explode over the Brandenburg Gate in Berlin, Germany, Monday, November 9, 2009, during the commemorations of the 20th anniversary of the fall of the Berlin Wall on November 9, 1989. (AP)

Smoke of fireworks is seen at the top of the Brandenburg Gate in Berlin, Germany, Monday, November 9, 2009, during the commemorations of the 20th anniversary of the fall of the Berlin Wall on November 9, 1989. (AP)

Former polish President Lech Walesa gives the thumbs-up before pushing the first of the painted dominos along the former route of the wall in Berlin on November 9, 2009, as part of the celebrations marking the 20th anniversary of the fall of the Berlin Wall. Some 1,000 giant dominos, many of them decorated by schoolchildren, will be toppled during the official ceremony. (AFP)

Heads of state walk through the Brandenburg Gate in Berlin on November 9, 2009, during celebrations marking the 20th anniversary of the fall of the Berlin Wall. (AP)

Spectators shield themselves against the rain near the Brandenburg Gate in Berlin, Germany, Monday, November 9, 2009, during the commemorations of the 20th anniversary of the fall of the Berlin Wall on November 9, 1989. (AP)

People wait for giant domino pieces, that have been placed along a stretch of the Berlin Wall's original path, to fall near Brandenburg Gate in Berlin November 9, 2009, during celebrations to mark the 20th anniversary of the fall of the Berlin Wall. (Reuters)