Washington, D.C., circa 1919. "Walter Reed Hospital flu ward." One of the very few images in Washington-area photo archives documenting the influenza contagion of 1918-1919, which killed over 500,000 Americans and tens of millions around the globe. Harris & Ewing glass negative. View full size.

Circa 1920. "Emergency Hospital group." Uniformed Authority Figure Week continues at Shorpy! Harris & Ewing Collection glass negative. View full size.

1919. "Fourth of July. Scenes in celebration at Walter Reed Hospital." The ever-popular Competitive Napping event, maybe. Or would this demonstration have another purpose? Harris & Ewing Collection. View full size.

"Army soldiers, Walter Reed Hospital." Back from the trenches in Washington, D.C., circa 1918. Harris & Ewing Collection glass negative. View full size.

1917. "Walter Camp exercise school. Cabinet officials exercising with other government officials." This seems to have been a manifestation of the "defense league" movement led by former Yale footballer Walter Camp. Anyone up for some miniature base(ket)ball? Harris & Ewing glass negative. View full size.

Nurse and patient at Walter Reed Army Hospital circa 1918 in Washington, D.C. Harris & Ewing Collection glass negative. View full size.

October 1917. Washington, D.C. "Knickerbocker Theatre." Harry Crandall's new Knickerbocker cinema at Columbia Road and 18th Street N.W. opened on October 13, 1917, with the historical drama "Betsy Ross," and an appearance by its star, Alice Brady. Less than five years later, 98 moviegoers were killed here when the roof caved in under an accumulation of snow during a blizzard. View full size.