Soldiers care for the wounded on the first day of the Battle of Passchendaele on July 31, 1917. Fought in West Flanders, Belgium, Passchendaele was one of the war's most costly clashes. Imperial War Museum, London hide caption

itoggle caption Imperial War Museum, London

Grover Cleveland, the only President to get married in the White House, married 21-year-old Frances Folsom, above, in the Blue Room in 1886. The blue furniture, as shown in Waddell's painting, Something Blue, is still in the White House collection. Click here to explore the painting. White House Historical Association hide caption

itoggle caption White House Historical Association

This May 24, 1961, photo provided by the Mississippi Department of Archives and History shows the booking photos of civil rights activist James Farmer, who was arrested — along with many others — during the Freedom Rides. AP hide caption

itoggle caption AP

Dwight Thompson (above right) spoke about The Kissing Case with his brother, James Hanover Thompson — and with his sister, Brenda Lee Graham (below). They spoke at StoryCorps in Wilmington, N.C. StoryCorps hide caption

itoggle caption StoryCorps

Olen Ham wears a "Hands off my Pension" button as he joins workers and their supporters to protest against two-tier wages outside the United Auto Workers union Solidarity house in Detroit, last October. Rebecca Cook/Reuters /Landov hide caption

itoggle caption Rebecca Cook/Reuters /Landov

Herzog was only permitted to enter the caves for one week of filming. Mark Valesella/IFC Films hide caption

itoggle caption Mark Valesella/IFC Films