How about the Parillo Mansion in Chicago? This thing in Lincoln Park is massive. Reportedly worth $40million (pre-recession). Even the gravel was supposedly shipped in from France.
By Chicagogeek.
http://www.flickr.com/photos/chicagogeek/3819277314/
By MACSURAk.
http://www.flickr.com/photos/macsurak/3138817916/
And some of the neighbors:
By Brule Laker.
http://www.flickr.com/photos/brulelaker/3103486456/