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The industrial past of Minneapolis and its impact on the city's tunnel system.
Yes — , ranging from major engineered road tunnels like the to stormwater and sewer conduits, historic waterpower bores and natural sandstone caves; reporting and municipal sources document multiple d...
Yes — has numerous real tunnels: and sandstone caves under the riverfront, municipal stormwater and utility tunnels, a 20th‑century highway tunnel, and many smaller pedestrian and railroad underpasses...
sits atop a layered subterranean history: 19th‑century milling tailraces and caverns carved into St. Peter sandstone that powered flour mills, an infamous that threatened the falls and surrounding ind...