This is pretty cool, if you’re interested in maps:

Don’t miss @SITUSTUDIO’s awesomely elaborate milled aluminum model of a disused gold mine: https://t.co/jZD9bmXkBn pic.twitter.com/A1g7eM8ZmX

— Geoff Manaugh (@bldgblog) November 25, 2015

The Homestake Mine in Lead, South Dakota, was once “the largest, deepest and most productive gold mine in North America,” featuring nearly 370 miles’ worth of tunnels.