Two guards perform an execution in China, one holding the gun, the other holding a mask over the victim's face. (Photo by General Photographic Agency/Getty Images). Circa 1925

An Iraqi soldier stands guard as a pipeline burns in the background after an explosion 30 kilometers (20 miles) northeast of Tikrit, Iraq, Monday, February 11, 2008. (Photo by Bassem Daham/AP Photo)

This unidentified teenager found Elvis Presley “too much” when he appeared at the Philadelphia Arena in Philadelphia, Pa., on April 6, 1957. (Photo by Bill Ingraham/AP Photo)

Three Chinese soldiers at the time of a civil war in China. (Photo by General Photographic Agency/Getty Images). 1922

A Philippine Airlines A300 Airbus plane lies near the service road of a highway south of Manila after it overshot the runway, September 19, 1987 in Manila upon landing from Singapore. Nobody was injured among 135 passengers and crewmen on board. (Photo by Bullit Marquez/AP Photo)

A Saudi soldier fires a mortar towards Houthi movement position, at the Saudi border with Yemen April 21, 2015. (Photo by Reuters/Stringer)

The body of one of several U.S. soldiers who were executed after being captured by North Korean troops just south of Seoul in early July 1950. (Photo by AP Photo)

The Flying Bull's P-38 Lockheed Lightning N25Y / 13 – Red Bull – Flying Legends Airshow 2012 Duxford (Photo by Rob Lovesey)