Serving as the headquarters of the U.S. Department of Defense, what is the largest low-rise office building in the world?

Built in little over 16 months, the Pentagon is spread across 6.5 million square feet and is divided by a whopping 17 miles of hallways. The office building is also said to be home to 691 water fountains, 19 escalators, 131 stairways, and 4,200 clocks!

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