Coober Pedy is a small desert town in Australia where the entire population lives in underground homes. With outside temperatures hovering over 100 degrees, residents made permanent homes in the cooler temperatures of old mine shafts.
The harsh summer desert temperatures mean that many residents prefer to live in caves bored into the hillsides.
A standard three-bedroom cave home with lounge, kitchen, and bathroom can be excavated out of the rock in the hillside for a similar price to building a house on the surface.
However, dugouts remain at a constant temperature, while surface buildings need air conditioning, especially during the summer months, when temperatures often exceed 40 °C.