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In page Doylestown, Pennsylvania:

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In the early 20th century, Doylestown became best known to the outside world through the "Tools of the Nation-Maker" museum of the Bucks County Historical Society. Henry Chapman Mercer constructed the reinforced concrete building in 1916 to house his collection of mechanical tools and utensils. Upon his death in 1930, Mercer also left his similarly constructed home Fonthill and adjacent Moravian Pottery and Tile Works, to be operated as a museum. The home was left on the condition that his housekeeper be allowed to live there for the rest of her life. She lived there and gave tours until the mid-1970s.[citation needed]