Caves are horrifying. Have you been inside a cave? They're horrifying. So yeah, they make great hospitals. Thanks, Kentucky.
This is the story of Dr. John Croghan's "consumptive cabins" inside of Mammoth Cave. Come for the ghosts, stay for the Pre-Americans, low C.H.U.D. awareness, anti-gypsy drywall, and the pro-consumption nanny state, and absolutely horrifying "remedies" for tuberculosis.
Sources:
https://adventure.howstuffworks.com/mammoth-cave-national-park-ga2.htm