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Henryton State Hospital is a now-closed hospital complex in Marriottsville, in southern Carroll County, Maryland, just across the Howard County line. The complex is located within Patapsco Valley State Park and along its southern end runs CSX's Old Main Line Subdivision and is very close to the Henryton Tunnel. The Henryton State Hospital center, or the Henryton Tuberculosis Sanatorium as it was called, was erected in 1922 by the Maryland Board of Mental Hygiene. It was established as a facility to treat African Americans suffering from tuberculosis. This was one of the first such facilities in Maryland erected to provide African Americans with the same level of treatment as whites. -wiki
