An array of radio towers sits behind security fences amid farms and pastures north of Fort Collins. This is home to WWV, the country's oldest radio call letters. The station's high-frequency broadcasts can be heard around the globe if you have the right kind of radio.
Now playing: pulsing sounds, every second, followed by an announcement of the exact time.
The station is run by the National Institute of Standards and Technology in Boulder, which is home to the atomic clock. WWV is capable of more than telling time. It could, if need be, save the world.