It was the most famous passage between East and West Berlin during the communist era, 1945 – 1990 and mainly a passage for embassy people.
Checkpoint Charlie was repeatedly attempted to use as an escape from East Germany: Some fared over while many were shot to death in the so-called “death strip” (Todesstreifen).
After the German reunification checkpoint was demolished in June 1990, there is now a museum; Mauer Museum is one of Berlin’s and Germany’s most famous sights.
Website: https://www.mauermuseum.de/
Address: Friedrichstraße 43-45, Kreuzberg, Berlin