More Cold War Gothic: abandoned listening posts. Gizmodo has a fine collection of ruined radar stations.
Between the 1930s and 1970s, billions of dollars were spent to build early-warning systems—often in the most remote parts of the world—that could detect missiles and aircraft. But by the late 1980s, most of these sites had been abruptly shuttered—made obsolete by the emergence of satellite communications. Yet the hulking shells, discs, and towers often still remain.
(thanks to Randy McCall)