Berlin is an important city for the history of Germany. The King of Prussia and the Emperor of Germany lived in Berlin. The government of Germany was in Berlin for many years. Bombs destroyed many buildings in the city in World War Two. The city was split into West Berlin and East Berlin after World War Two. After the Berlin Wall was built in 1961 very few people were allowed to cross from East Berlin into West Berlin. The wall divided the city until 1989 when the East German government decided to allow anyone to cross, and people decided to destroy the wall.