Glenn Dale (also sometimes spelled Glenndale) was once a tuberculosis sanitarium for the population of Washington D.C. in the 1930s. The treatment buildings are mostly comprised of open and closed terraces to let fresh air envelope the patients, one of the few known treatments for TB at the time. There are two large buildings on campus, the tall adult facility and the sprawling children's hospital, each had their own morgue.

After the tuberculosis epidemic died out, Glenn Dale hospital was used to treat the chronically ill. The facility closed in 1981, much of the place is stripped and a little trashed, but the terraces overgrown with vines are a beautiful sight. County cops and park police patrol the grounds regularly.