In pictures: UPI's most iconic pictures of the 20th century(50 images)

There are more than 3 billion cameras in use across the world, but over the course of the 20th century, as the medium was coming into its own, the documenting of world events rest in the hands of a few. One of those trusted organizations was UPI Newspictures. Formed in 1952 with the absorption of Scripps' ACME Newspictures, and then expanded on May 24, 1958, when United Press merged with Hearst's International News Service, UPI Newspictures produced many of the most important images of the century and continues to do so to this day.

An American soldier with the First Army Division sleeps atop a pillbox bunker during a monsoon downpour following heavy Vietcong sniper and mortar fire near Phuc Vihn, South Vietnam on June 17, 1967. Winner of the 1968 Pulitzer Prize for Feature Photography. Photo by Toshio Sakai/UPI
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