If you visit Berlin and haven't seen the Brandenburg Gate, you really can't be helped. It is the city's most important landmark and the symbolic place for German unity. The Brandenburg Gate was built from 1788 to 179+1 according to the plans of Carl Gotthard Langhans, who is based on the Propylaea of the Acropolis. While the Brandenburg Gate is a symbol of unification today, it was a symbol of German division in GDR times. The Brandenburg Gate was expanded in 1793 with the Quadriga by Johann Gottfried Shadow.