OK. First off I apologize for not being more P.C. "Everyone's Home is Their Castle"?
Here ya'll go. A real castle and it's available! Includes a rifle range and a fallout shelter!
(http://www.blogsmithmedia.com/www.luxist.com/media/2008/06/aamsterdamcastle1.jpg)
http://www.luxist.com/2008/06/23/amsterdam-castle-estate-of-the-day/?icid=100214839x1204651305x1200224749
My only reservation is that it's on the National Historic Registry... sort of limits the colors you could paint those bricks. ;D ;D
It's upside down-- it is sticking out of the ground. hmm