Berlin rings in the anniversary with 200 events in key locations of the city. A new AR app even gives users an interactive experience with the former wall.

U.S. President Ronald Reagan, commemorating the 750th anniversary of Berlin, addresses on June 12, 1987, the people of West Berlin at the base of the Brandenburg Gate, near the Berlin Wall.

The Berlin Wall, approximately 27 miles long, is dismantled by a crane as East Germany begins to dismantle the wall on Feb. 20, 1990, near the Brandenburg Gate in East Berlin, as a crowd watches.

President Obama will deliver a speech to Berlin at Brandenburg Gate; Ronald Reagan delivered his famous %22tear down this wall%22 speech in 1987 at the gate ...

11 A lifted border gate as seen from the eastern side of the Berlin Wall on November 9, 1989. 12 Citizens from East and West Berlin embrace on November 10, 1989.

The Berlin Wall, approximately 27 miles long, is dismantled by a crane as East Germany begins to dismantle the wall on Feb. 20, 1990, near the Brandenburg Gate in East Berlin, as a crowd watches ...

In this Nov. 11, 1989, photo, East German border guards are seen through a gap in the Berlin wall after demonstrators pulled down a segment of it at Brandenburg gate. (LIONEL CIRONNEAU/Associated ...

A woman cycles past a part of the Berlin Wall with the Martin-Gropius-Bau gallery in the background in Berlin on September 24, 2012. AFP PHOTO / DAVID GANNON ...

8-1-1963, DEC 6 1969, DEC 10 1969A sentry fixes his binoculars on activity across the Berlin WallThe wall of iron, wire and stone went up in that heated summer of 1961.Credit: Flip Schulkearchiveblog ...

In this Nov. 10, 1989, file photo, two men proudly show off bricks of the Berlin Wall they found near Brandenburg Gate in Berlin after the opening of the East German border to the West.

East Side Gallery 3-kilometer section of the Berlin Wall. Following the Wall's fall in 1989, ... The Brandenburg Gate is an ...

On September 19, Germany will honor a speech, delivered 25 years ago, with a permanent plaque on the very spot where President Reagan gave it in front of Berlin’s Brandenburg Gate.