Reference

The former hot dog stand nicknamed Cafe Ground Zero [7] in the Pentagon's center courtyard. During the Cold War, the Pentagon (headquarters of United States Department of Defense in Arlington County, Virginia) was an assured target in the event of nuclear war. The open space in the center of the Pentagon became known informally as ground zero.

Standing at the center of the courtyard of the Pentagon in Arlington, Virginia is a modest little hot dog stand affectionately known as Cafe Ground Zero. It has tendered its fare to hungry ...

TIL I learned about the Pentagon's "Cafe Ground Zero." A hot dog stand in the middle of the pentagon that the Soviets believed housed the most top secret meeting room because satellite images showed U.S. military officers entering and exiting the hot dog stand at the same time every day.