1-2 days. Visit one of Germany's most interesting cities. Potsdam offers Northern Europe's most beautiful surroundings. The royal Park Sanssouci, Cecilienhof (The Potsdamer Conference in 1945), Neuer Garten, the castle of Babelsberg and Glienicke Dorf are all sights listed by and under protection of the UNESCO. The tour can be made by boat. The district is characterized by architecture from seven different nations.