I was reading the evil genius series ebooks and hard copy versions of projects for the evil genius, and was thinking about the antigravity machine they had listed. By far, people should be creating floating castles by now - if you think about it.
How could you make an antigravity castle?
as far as I can tell, the only major barrier is finding a large enough magnet , but we have the technology people. I'll post the scematics if i find them.