Castles of America: tours of opulent mansions

From the auto baron estates of Detroit to the high-society mansions in Newport, Rhode Island, visits to the most sumptuous houses in America provide a window on how the rich and famous lived out their wildest dreams. Everyone is curious about the lifestyles of people blessed with unlimited cash. And we've all envisioned our own ideal home, fantasizing how we would relax and entertain in a showplace castle designed to satisfy our every whim.