A sanatorium is a special medical facility where people go to recover from long-term illnesses, especially lung diseases like tuberculosis. Before modern antibiotics were invented, doctors believed that fresh air, rest, and good food could help sick patients heal. Sanatoriums were often built in mountains or forests where the air was clean and pure.

In the early 1900s, sanatoriums were common across America and Europe. Patients might stay for months or even years, spending their days resting on outdoor porches, even in winter, bundled in blankets while breathing mountain air. These facilities had strict schedules: patients would rest, eat nutritious meals, and slowly regain their strength. Some sanatoriums were quite luxurious, with beautiful grounds and comfortable rooms, while others were more basic.

By the 1950s, new medicines made tuberculosis curable, and most sanatoriums closed or became regular hospitals. Today, the word can describe any facility focused on rest and recovery, though we more commonly use terms like “rehabilitation center” or “treatment facility.”

You might encounter sanatoriums in historical fiction or old movies, where a character goes away to “take the cure” at one of these mountain retreats.