Mine crater at La Boiselle, the Somme, France, World War I, c1916-c1918. Artist: Realistic Travels Publishers

Mine crater at La Boiselle, the Somme, France, World War I, c1916-c1918. The crater was created by a massive underground mine placed in tunnels beneath the German lines by British sappers of the Royal Engineers. Known as the Lochnagar Mine, it was detonated on 1 July 1916 on the opening day of the Battle of the Somme. The crater has been preserved and is the site of a war memorial. Stereoscopic card detail. (Photo by The Print Collector/Print Collector/Getty Images)