Detroit is not just a bustling metropolis above ground, but also an intricate network of tunnels below. These tunnels hold secrets that shed light on the city’s history. While most of the tunnels are now closed off to the public, they provide context to Detroit’s national importance. One interesting tunnel is the pedestrian walkway built in the 1920s to combat the spike in pedestrian deaths due to the popularity of automobiles. Another is the salt mines that operated from 1895 to 1984 and produced rock salt for the city. There are also tunnels connecting the Fisher Building and Detroit Medical Center, as well as tunnels used during Prohibition and for utility purposes. Beyond the city, there is the psychedelic Light Tunnel at Detroit Metropolitan Airport and the extensive tunnel system beneath the former Northland Center mall. The content does not contain any controversial information.
https://www.freep.com/story/news/local/michigan/2024/02/10/underground-tunnels-detroit-michigan/72060366007/