Ringwood Manor in Passaic County, New Jersey was the site of an ironworks and home to a number of well-known ironmasters from the 1740s to the late 19th century. The current manor house was not built until 1807.
I visited there recently and took a few photos.
I had the goosebumps while I was there.
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https://en.wikipedia.org/wiki/Ringwood_Manor