The fictional Castle Verdammung or Castle Doom, the vampire elders' stronghold in the Black Forest of Germany, commands an important role in the Guardian Witch books. I thought it might be interesting to take a look at a few of the real castles that still exist in Germany today.
Daily Rhine River cruises take you past these edifices of the past, and a few castles are open to the public as restaurants, museums or for guided tours. A video of the area can be found here: http://www.ricksteves.com/watch-read-listen/video/tv-show/germanys-romantic-rhine-and-rothenburg
(Author's irrelevant note: It's a long walk up the castle's drive!)
More of the castle's history can be found here: http://www.neuschwanstein.de/englisch/idea/index.htm and http://en.wikipedia.org/wiki/Heidelberg_Castle
An awesome experience, especially at dusk when the crowds thin and you can begin to imagine what it was once like.
(See Rick Steves video above on the Rhine Tour which also includes Rothenburg)