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With over four acres' floor space and 250 rooms, the enormous Biltmore Estate in Asheville, North Carolina, has plenty of places to hide. George Vanderbilt III built one of the world's largest private residences at the height of the Gilded Age and filled it with fascinating details, including clandestine doors, underground passageways, a gentlemen's only smoking room, and a private reading den. One of the most popular tourist attractions in the state, Biltmore Estate proves that even the most-visited places have their secrets.