COOBER PEDY, AUSTRALIA - OCTOBER 22: An abandoned underground dwelling is seen cut into the side of a hill on October 22, 2015 in Coober Pedy, Australia. (Photo by Mark Kolbe/Getty Images)
COOBER PEDY, AUSTRALIA - OCTOBER 22: An abandoned underground dwelling is seen cut into the side of a hill on October 22, 2015 in Coober Pedy, Australia. (Photo by Mark Kolbe/Getty Images)