Did you know there’s a hidden world below the streets of Detroit? Roughly 1,100 feet down sits a massive salt mine stretching over 1,500 acres with more than 100 miles of tunnels. A full-blown city beneath the city. And it’s still in use today. It all started 400 million years ago, when a prehistoric sea dried up and left a thick bed of salt buried deep beneath Michigan. In 1895, drillers hit rock salt. By 1906, the first shaft was underway. The work was brutal. Explosive gas, extreme heat, and

Did you know there’s a hidden world below the streets of Detroit? Roughly 1,100 feet down sits a massive salt mine stretching over 1,500 acres with more than 100 miles of tunnels. A full-blown city beneath the city. And it’s still in use today. It all started 400 million years ago, when a prehistoric sea dried up and left a thick bed of salt buried deep beneath Michigan. In 1895, drillers hit rock salt. By 1906, the first shaft was underway. The work was brutal. Explosive gas, extreme heat, and