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Men of the US Army Polar Research and Development Center erecting a 'T5' building in a lateral trench at Camp Century, an Arctic United States military scientific research base in Greenland, June 1959. The base is a network of trenches dug out of the snow and ice and lined with corrugated steel arches. Camp Century was later found to be a 'cover project' for Project Iceworm, a secret plan to install nuclear missile launch sites under the Greenland ice sheet. Both Camp Century and Project Iceworm were abandoned in 1967 when it emerged that the Greenland ice was not stable enough for the structures to be viable in the long term. (Photo by US Army/Pictorial Parade/Archive Photos/Getty Images)