This Huntsville stop is a roadside Texas historical marker describing the state penitentiary's role in Confederate-era manufacturing during the Civil War. It is not an abandoned prison attraction or paranormal tour, so visitors should expect a plaque and exterior historical context rather than building access.
Filed under weird history: real events too strange to have made the textbook.
Practical details from OpenStreetMap, licensed ODbL.
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Source: hmdb.org/m.asp