"going remote" to where civilization reaches its limits
"The word 'Thule' originally refers to an imaginary place on the edge of civilization, the 'northernmost habitable land.' Ultima Thule was a place thought to be even beyond that, according to the musings of the 4th century geographer Pytheas - the northernmost place. Today, no longer simply mythological and hypothetical, Thule is a physical area, the American outpost on the northwestern corner of Greenland, 700 miles north of the Arctic Circle.--"CLUI Exhibits in Greenland: Thule airbase subject of frigid program," in The Lay of the Land, The Center for Land Use Interpretation Newsletter, Winter 2007, Vol. 30.
Learn more about Thule in CLUI's Lay of the Land newsletter
credit: CLUI
Cheyenne Mountain
credit: North American Aerospace Defense Command
"The mountain was hollowed out, and fifteen buildings, most of them three stories high, were erected amid a maze of tunnels and passageways extending for miles. The four-and-a-half-acre underground complex was designed to survive a direct hit by an atomic bomb. Now officially called the Cheyenne Mountain Air Force Station, the facility is entered through steel blast doors that are three feet thick and weigh twenty-five tons each; they automatically swing shut in less than twenty seconds."
The North American Aerospace Defense Command (NORAD) on life inside the mountain