Coober Pedy is a mining town in the desert of South Australia. The city's population was 1,695 in 2011, which means that this city is really small. To escape from scorching temperatures, people have created an amazing underground "world" where you'll find everything: from a bookstore to a church, and even a hotel. Yes, people live underground there. Coober Pedy is also known as "the world capital of opals", because it is home to one of their richest fields (about 30% of the world's total reserves). By the way, did you know that opal is the national stone of Australia? 95% of all opals in the world are mined here! You should be ready to pay more than 1000$ to buy at least one stone.
