I'm going to answer a slightly different question: What did people do after the Berlin Wall was opened? It took a long time to tear down the Wall, and some of it was left standing intentionally.
After the Wall opened, people who lived in East Germany flocked to West Berlin. Each person was given DM100 spending money by the West German government. Most of them spent it in West Berlin food stores, which had things like fresh fruit, toilet paper without metal shavings in it and special baked goods you never saw in East Berlin. You could sell East marks in West Berlin, but the exchange rate was very bad: 100 East marks would get you 16 West marks. (The other side of the story: a lot of West Berliners exchanged West marks for East marks at the basically-fixed exchange rate of DM18:M100 and went hog wild in East Berlin.) After they did their sightseeing, shopping and visiting relatives who they hadn't seen in years, they got on the U-bahn and S-bahn and went home so they could go to work in the morning.
The Berlin wall was torn down in the twentieth century.
rebuild it
The Berlin Wall was torn down in the 20th Century (1989-90).
The Berlin Wall was torn down by the East German government, who owned it.
torn down
The Berlin Wall was built in 1961. It was completely torn down from 1989 until 1991. All of this happened during the 20th century.
The fall of the Berlin wall was the year 1989.
The Berlin Wall.
20th century
It was torn down in 1989-1990
No, once down it remained down.
The Berlin Wall being torn down