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Mammoth Cave, Kentucky. Image source: Wikimedia Commons

In 1842, Bowling Green, Kentucky, the Mammoth Cave held a bizarre scene. Thin figures wearing dressing gowns moved weakly in and out of the huts. There were frequent noises of coughing and hollowing. The cave held consumptive or tuberculosis patients who were volunteers of a medical experiment. The experiment lasted for a short period of 5 months. Five people lost their life inside the cave and the others died soon after getting back to the surface.


  • There were 10 wooden cottages located at a distance of about a mile and half from the entrance of the cave where the patients lived. These cottages measured 12×18 feet which had canvas roofs and furrowed floors. There were two stone cottages, one served as the dining room and the other was a residence.
  • Cool air was considered healthy for the patients so they were told to keep the temperature of their cottage as low as possible. The patients controlled the temperature through a stove and thermometer which was present in every cottage.

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Mammoth Cave National Park preserves the cave system and a part of the Green River valley and hilly country of south central Kentucky. This is the world’s longest cave system, with more than 365 miles explored. Image: Wikimedia Commons

  • The residents synced their schedule to that of the outside world. The cave was dark which was lit by fat lamps during the day and with taper candles at night. The residents did not bother about the darkness as they got used to it. The patients spent their time talking to each other, exploring the cave and reading books.
  • The residents attended episcopal services held each Sunday and read sermons. Their meals were brought by outside slaves that usually included venison.


  • In the 19th century, medical science didn’t have much to offer. Fresh air, healthy food and gentle exercise were the basic tools of treatment. Although cave air was known to improve health according to physicians belonging to the era.
  • The air inside the Mammoth cave is believed to be exceptionally potent. It maintained a temperature of 60 Fahrenheit and was a bit moist. It was proved to be beneficial for the lungs and imparted energy.
  • The promoters of the cave noted that the workers inside the cave’s saltpeter mine never fell ill. Some of the oldest newspapers belonging to that era noted that human and animal remains found inside the Mammoth cave were still undecayed and intact.

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  • Owing to the curative properties of the cave air, Dr. John Croghan purchased the Mammoth cave for $10,000 in 1839 and built a large health resort. In the year 1842, he welcomed 11 patients who began Croghan’s medical experiment.


  • The patients believed that their deteriorating condition justified participating in this unusual action.
  • One patient claimed that he felt stronger, took the exercise and preserved a good diet.
  • However, one can’t deny the difficulties of cave life. The patients wished to go return home to their families as they were feeling isolated. There was lack of lightening and a lot of smoke from cooking fires.
  • Reportedly, only one person named Oliver H.P Anderson returned home after the end of medical experiment. A slave and cave guide said that the patients looked like a company of skeletons.
  • After 5 patients died, their bodies were laid put on the Corpse Rock. After the beginning of the deaths, Croghan ended the medical experiment as made the patients return. These patients died not long after they returned home.


  • Croghan never said or published anything about the disastrous result of the experiment. He did not display any feelings about the people who lost their lives. Croghan was hesitant to accept failure.
  • However, physicians believe that fresh air is a good remedy for tuberculosis even after the Cave experiment failed. Croghan gave up on the idea to turn the cave into a health resort. He glorified the cave by turning it into a tourist destination which still persists.
  • No other physician ever repeated this medical experiment and no their patient took residence in this cave. The wooden huts were dismantled whereas the stone cottages remain standing.
  • Just like his patients, Dr. Croghan also died of tuberculosis in 1849.


  • Horace C. Hovey, in his 1882 guide book, says, “The air is slightly exhilarating and sustains one in a ramble of five or ten hours, so that at its end he is hardly sensible of fatigue”
  • Stories of the cave came to be popular among the cave’s visitors and literature.
  • The cave’s visitors reported hearing coughing sounds from around the huts in the cave.

A national park ranger guiding tourists through Mammoth Cave Image: Wikimedia Commons

  • Croghan’s experiment is still appreciated by many physicians. The cool climate is believed to cure consumptives.
  • Physicians of the mid-19th century noted that the absence of light made the disease worse and led to increase in deposition of tubercles in the lungs.
  • Tuberculosis or the “white plague” remained incurable until the discovery of streptomycin in 1943.
  • Visitors today enjoy exploring this dark, gloomy and bizarre place. The site is being operated by National Park Service since 1941. It offers tours of the cave and its surroundings.
  • The visitors have to go for the Violet City Lantern Tour or Historic Tour of the Cave to view the stoned tuberculosis huts.
  • The NPS does not allow people with serious health conditions to take the tour even though people claim that cave air improves their health.

-by Shubhi Mangla, an intern at Newsgram. Twitter @shubhi_mangla



Wikimedia Commons

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