A Pyramid In The Middle Of Nowhere Built To Track The End Of The World

The Stanley R. Mickelsen Safeguard Complex in Cavalier County, North Dakota, is the focus of an amazing set of images hosted by the U.S. Library of Congress, showing this squat and evocative megastructure in various states of construction and completion.
It's a huge pyramid in the middle of nowhere tracking the end of the world on radar, an abstract geometric shape beneath the sky without a human being in sight, or it could even be the opening scene of an apocalyptic science fiction film. But it's just the U.S. military going about its business, building vast and other-worldly architectural structures that the civilian world only rarely sees.