It's funny you should post this article, because I was on a website this morning, dedicated to Castles in the U.S. I was actually looking for info on the house "Seaview Terrace" used in the TV series "Dark Shadows." I came across this website on castles around the country:
Castles of the United States
I don't know how up-to-date it is, but if you scroll down the page a bit, there is an index of states, with links to photos and text about various castles built in this country.
