Why yes, right here in our local medieval Phoenix.
Some friends visited us and took us geocaching. That was a first. There's nothing like inconspicuously rummaging around telephone poles and wire fences for duct-taped peanut butter jars. Anderson accidentally inspected someone's "doggy bag," thinking it might be a cache.
Anyway, one of the geocache sites was right next to the castle, which is how we found it. Sadly, just as Anderson was about to make a new friend, the castle driveway was blocked off with no-trespassing signs.
Here is the story (I can't confirm it's a scholarly source): http://www.dupontcastle.com/castles/copenhav.htm Dad, if it comes up for sale again, I'll let you know. I think it would make a great retirement home. Think how much fun your grand kids would have on the moat and drawbridge.