When Jordan Roberts first visited an old gravel mine outside of Grayling, in the middle of northern Michigan, he was struck by the landscape.
“If I were a teenager I would just have so much fun on this gravel pit,” he said. “It's this massive sand dune.”
The former mine, now managed by Michigan’s Department of Natural Resources, has been vacant for years. Most recently state police used the area, known as 7 Mile Pit, as a shooting range.