At Nordbahnhof in Berlin you will find a small museum about how the subway system were run during the time of the Berlin Wall.
There are many castles around Potsdam. The most famous one is Freiderick the Great favorite castle – the Schloss Sanssouci.
If you are coming to Berlin in December you probably want to go and visit one or more of the
When we go back from the Christmas market in Potsdam we take the tram. And obviously Santa is driving it since it is Christmas time.
If you are in Berlin you might go for a daytrip to the nearby city of Potsdam – after all