One day in Potsdam was not enough! Gerhardt has full knowledge of the history of Germany and had incredible detailed stories behind the buildings, area, monarchy and changes over time. He was able to point out the new vs old architecture and had delightful insights that brought the town to life. We should have scheduled another day in Potsdam just to have time to visit more of the museums. This trip was a wonderful complement to the more modern history we received during our walking tour of Berlin.