The Berlin Wall was constructed on August 13, 1961, by the German Democratic Republic (GDR, East Germany).

The Berlin Wall was constructed for a variety of reasons, including to prevent East Germans from escaping to West Germany, to protect East Germany from invasion by West Germany, and to control the flow of goods and people between East and West Germany.

The Berlin Wall stood for 28 years, from 1961 to 1989.

The exact number of people who died trying to cross the Berlin Wall is unknown, but it is estimated that over 100 people died.

In 1987, Ronald Reagan gave a famous speech in front of the Berlin Wall in which he said, "Tear down this wall!"

The Berlin Wall was finally torn down on November 9, 1989.

The fall of the Berlin Wall had a profound impact on the world. It marked the end of the Cold War, led to the reunification of Germany, and inspired democratic revolutions throughout Eastern Europe.

The Berlin Wall Memorial is a museum, monument, and park that is dedicated to the history of the Berlin Wall and the victims of the Berlin Wall.

The Berlin Wall Memorial receives over 3 million visitors each year.

The East Side Gallery is the most popular tourist attraction at the Berlin Wall Memorial. It is a 1.3-kilometer-long section of the Berlin Wall that is covered in colorful graffiti.

The Berlin Wall Trail is a hiking, biking, and running trail that follows the route of the Berlin Wall.

The Berlin Wall Trail is 160 kilometers long.

Over 300,000 people use the Berlin Wall Trail each year.

The East Side Gallery is the most popular section of the Berlin Wall Trail. It is a 1.3-kilometer-long section of the Berlin Wall that is covered in colorful graffiti.