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Wightmans Hall (100,000+ sq ft) in Philadelphia's suburbs was built for fortune — now a historic site. Near Pittsburgh, the Rural Gothic mansion Helen Waddell estate reflects early 20th-century opulence, with expansive grounds and luxurious details.
Rhode Island: The Breakers — An Icon of the Gilded Age
In Newport, The Breakers was built in 1895 as the summer home for the Vanderbilt family. Its 70 rooms, Vanderbilt-designed decor, and ocean views make it Rhode Island’s largest mansion and a symbol of America's Gilded Age excess.