One day trip
is the capital of the state Brandenburg, it is just next to Berlin – trains from Alexanderplatz bring you there in 30 minutes. Not a single bomb fell into the city until April 1945 – they wanted to wait and see what a nuclear bomb does to an undamaged city. When it wasn‘t delivered in time, the whole place was wiped out with conventional bombs in a single attack and the nukes were “tested” in Japan. Fortunately, the 18th-century palaces survived.
Schloss Cecilienhof was where the allied conference in August 1945 was held, Orangerieschloss, Neues Palais and Charlottenhof will make you palaced out for good.
Schloss Sanssouci with its vast, beautiful park is a must. Potsdam itself is a nice smaller city with some small nice shops. Definitely worth to visit!