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• December 28, 2011 DPirotte updated the SubTropolis
  

  SubTropolis

  The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri

  There are a number of advantages to keeping things underground. The temperature remains near constant; energy costs are lowered; and—in the massive, 55,000,000-square-foot space known as... »

  Natural Wonders, Geological Oddities, Curious Caves, Architectural Oddities, Long Now Locations, Subterranean Sites | Edited by Dylan, wythe and others