The United States is pretty famous for its whole "anti-monarchy" thing, but that doesn't mean American royals have resisted building their own versions of certified castles. From the sprawling estates (plural) of the Vanderbilts, to opulent structures built for business tycoons, the U.S. boasts a few residences to rival Buckingham - and you're allowed to visit! Now's your chance to be a society princess for a day.

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