But in 1916, during World War I, it did just that. Not to mention, it also cared for many wounded Nazi soldiers during WWII — and then the Soviet military from 1945 until the Berlin wall fell in 1990.
It was built in 1898 as a sanatorium to house people with tuberculosis, a fatal disease then, and a small section of the enormous complex is still used for neurological rehabilitation, according to Atlas Obscura.
But the rest has been abandoned, save for the occasional tour; with its crumbling surgical and psychiatry wards, you can understand why Conde Nast Traveler considers it one of the most terrifying places on the planet.
See why in the pictures below; you can almost feel the creepy vibes coming at you from your very screen.