Can't get enough of the Hobbit? Take a trip to Coober Pedy, where 3,000 of the town’s residents live underground. The heat in South Australia is killer, which is why most of the town chooses the underground lifestyle. That, and the available work -- Coober Pedy produces 70% of the world’s opal. "Kupa Piti", the term Coober Pedy is derived from, literally means "white man's hole in the ground." The city is much more than just a hole though, complete with a church, hotels, restaurants and plenty of shopping.