This May 29, 1919 photograph showed rows of tents that had been set up on a lawn at Emery Hill in Lawrence, Massachusetts where victims of the 1918 influenza pandemic were treated.
The 1918 influenza pandemic killed an estimated 20-50 million people worldwide, including 675,000 in the United States. The pandemic’s most striking feature was its unusually high death rate among otherwise healthy people aged 15-34.
CDC, released into public domain.