The film "Philadelphia Story" has been mentioned here a few times. The estate which inspired it, Ardrossan, is being put up for sale by the Scotts.
(The Inquirer usually keeps links active ("free") for two weeks, so apologies if you see this after that date):
http://www.philly.com/philly/news/homep ... s_act.html
http://www.philly.com/inquirer/world_us ... _down.html
http://www.philly.com/inquirer/world_us ... sense.html