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4. Australia’s Opal Caves

When opals were discovered under the ground in Coober Pedy, about 525 miles outside of Adelaide, Australia, in 1915, people flocked to the site to strike it rich. They soon discovered; however, the climate was hostile to year-round living, as the temperatures can reach more than 115 degrees Fahrenheit in the summer months. Underground, however, the temperatures remain cool and constant. Soon enough, folks had figured out how to bore caves into the bedrock to make permanent dwellings. Some homes are so large and impressive that they can span nearly 5000 square feet and are as diverse as churches, art galleries, shops, and even a luxury hotel. Can't have enough of these incredible places to live on Earth! Keep reading for more information...