1.An American G.I. tends to the wounds of a young German soldier while waiting for the arrival of a medic in 1944.
2.Buzz Aldrin snaps a photo of Neil Armstrong as he tears up after walking on the moon in 1969.
3.Charlie Chaplin learns the manual alphabet from Hellen Keller in 1919.
4.Undeterred by recent bombings, London residents visit what's left of a library during World War II.
5.In 1967, Boston marathon organizer Jock Semple chased after Kathrine Switzer after he realized a woman was running. Other runners stopped him and she finished the race.
6.Australian stretcher bearers help a Japanese prisoner with malaria captured near Nauro in 1942.
7.A group of men and women gleefully demonstrate against Prohibition in 1932.
8.Apollo 16 astronaut Charles Duke immortalizes his family by leaving a photo of them on the moon in 1972.
9.Martin Luther King Jr. leads a group of marchers in Alabama to fight for black suffrage in 1965.
10.The Brighton Swimming Club poses in their top hats before going for a swim in 1863.
11.During the Christmas Truce of 1914, German and British soldiers play a game of soccer in the "no man's land" between trenches.
12.A US Marine stops to share food and water with three children on the Mariana Islands in 1944.
13.Seventeen-year-old Jackie Mitchell, one of the first female pitchers in professional baseball, poses after striking out both Babe Ruth and Lou Gehrig in 1931.
14.German soldiers take a moment to decorate the trenches in celebration of Christmas during World War I.
15.An AIF soldier gets an exuberant welcome home in Sydney in 1919.
16.John F. Kennedy Jr. plays under his father's desk in 1963.
17.Sgt. Edward F. Good feeds Pfc. Lloyd Deming a leg of Christmas turkey at the 2nd Field Hospital in 1944.
18.A sergeant of the Royal Army Veterinary Corps bandages the wounded ear of a dog in 1944.
19.A sign outside Ellenton, SC in 1950 after the residents were relocated due to the city limits becoming inhospitable after a facility for creating nuclear bombs was constructed.
20.A German prisoner helps escort wounded British soldiers to a medic following fighting on Bazentin Ridge in 1916.
21.The crew of Apollo 1 kick back while practicing water egress procedures in 1966.
