Wyndclyffe Castle in Rhinebeck, New York was sold at auction on Wednesday to an anonymous bidder. The mansion was originally built in 1853 as a summer estate for New York City socialite Elizabeth Shermerhorn Jones, the aunt of novelist Edith Wharton. The property's extravagance is said to have prompted owners of nearby Hudson Valley estates to build even bigger mansions, inspiring the phrase 'Keeping up with the Joneses'.