[JtD]

For the culturally interested:
Potdam has no castle, it has a load of palaces, parks and gardens, though.
Cecilienhof is where the Potsdam conference took place, it was a residence for the last German Kaiser.
The palace in the picture is not Cecilienhof, it is the Belvedere on the Pfingstberg, a smaller royal recreational residence on a hill, very close to Cecilienhof. Belvedere from the French good view, because you get an awesome view over the Havel river, islands and hills as well as the palaces and gardens of Postdam and south-west Berlin.

Neither palace was disabled by bombs, don't think they actually were targeted. Cecilienhof, only a couple of dozen meters away from the Berlin wall, was kept in good condition all the time, with lots of tourists coming for a visit, but the Belvedere was closed to the public and left to rot up to 1989, because it did not only give a good view of the landscape, but also of a Soviet military component harbouring thousands of Soviet soldiers, ready to attack the West / defend the East in case the Cold War got hot. It was reconstructed after 1989 and is open to the public now.