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Fonthill Castle

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This was the palatial abode of American archaeologist Henry Mercer and it is one of the most stunning examples of a poured-in concrete building. You'll need reservations and a few hours to tour the castle as it features 44 rooms, 10 bathrooms, and 18 fireplaces. But you'll also want to examine the artwork and artifacts, many of which were embedded into the concrete when it was poured.