Tear down this wall!

"Tear down this wall!" was the challenge made by United States President Ronald Reagan to Soviet Union leader Mikhail Gorbachev to destroy the Berlin Wall. The speech was made at the Brandenburg Gate near the Berlin Wall on June 12, 1987. It was made to honor the 750th anniversary of Berlin. 
Among the spectators were West German president Richard von Weizsäcker, Chancellor Helmut Kohl and First Lady Nancy Reagan.
Reagan challenged Gorbachev, who was then the General Secretary of the Communist Party of the Soviet Union, to tear the wall down as a symbol of Gorbachev's desire to increase freedom between Eastern and Western Germany.
The speech is thought to be one of the greatest speeches by Reagan or by any other president.