Realms of Legend.
The plan for this idea seems to be a small city and to have the largest castle and grounds in the United States. It certainly doesn't appear to be something that could be built by one or even a few people, and looks like it should require a large number of investors, lots and lots of money, and years to construct. Interesting idea, but the lack of updates to the site since the earlier parts of this year makes me wonder if the idea is no longer being pursued... I'll just have to categorize this one with the rest of the "wish castles" until something more substantial shows up on the site.