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This castle was built entirely of conrete including the roof by Henry Chapman Mercer in 1916 in Doylestown, PA. Henry also built the Fonthill where he lived only a few blocks away.


Here is an excerpt from their webpage.
(Towering castle houses dramatic displays of the implements, folk art and furnishings of early America before mechanization. Walk into the Central Court and see a Conestoga wagon, whaling boat, carriages and an antique fire engine suspended overhead. There are 40,000 tools of more than 60 early American crafts and trades displayed. Constructed in 1916, it is a National Historic Landmark.)


http://www.mercermuseum.org/mercermuseum/index.html