Berlin Super Saver: City Bike Tour plus Potsdam Day Trip by Train with Bike Tour. Make the most of a trip to Berlin with this 2-day Super Saver tour that features guided bike treks around both Berlin and Potsdam. Learn the history of Berlin, from its beginnings, to its role as capital of the Nazi Third Reich, to the divided city of the Cold War, to the modern-day capital of a unified Germany. Then take a train ride to Potsdam to discover its beautiful palaces, parks and gardens by bike. A train ticket plus the use of a bike and helmet is included. Book and Save 12%! Berlin Super Saver: City Bike Tour plus Potsdam Day Trip by Train with Bike Tour.