This poignant image (cheer up, buddy!) of a pup named "Blizzard" was taken in 1912 by Antarctic adventurer Frank Hurley, who two years later would be the photographer on Ernest Shackleton's famed Endurance Expedition. This shot is from the First Australasian Antarctic Expedition, which set out in 1911.
This picture from World War I seems to perfectly capture the chaos of war. There are soldiers marching forward, there are airplanes flying above, there are bombs, there are clouds of smoke. But it's not 'real'.