A sanatorium was a medical facility.
On 10 November 1887, Doc Holliday died of tuberculosis in the sanatorium at Glenwood Springs, Colorado. (PROSE: The Gunfighters)
In 1893, O'Keagh was an orderly at the sanatorium where Sebastian Chiltern was committed by his twin brother Nathaniel. (PROSE: Camera Obscura)
In 1926, the Seventh Doctor battled the Celestial Toymaker in a Swiss sanatorium. (AUDIO: The Magic Mousetrap)