One of the fascinating realities about Jerome is that it sits atop a massive network of mining tunnels, hidden directly underground. Visitors to the Audrey Headframe Park can stand on a plexiglass platform and peer into a shaft that goes straight down more than 1900 feet. (For comparison, the Empire State Building is 1450 feet tall.) The Jerome State Historic Park has a 3D model of the mining shafts, tunnels, fault lines, and deposits that sit below the surface. Until I saw that model, I had no idea such a massive operation was sitting directly below the historic buildings.