Thought to have once been one of America's most secretive places, this historic missile bunker is one of a network built in out-of-the-way places in response to the nuclear threat posed by the Cold War with the Soviet Union in the 1960s.

Decommissioned decades ago, it stood abandoned for years before the owner decided to put the whole complex up for sale, which required excavating a new entrance and breaking the seal on this military time capsule. What they found there provides a fascinating insight into US military history, including the day-to-day lives of the personnel who worked there. Let's take the tour...