There are a few places on Earth that feel decidedly unearthly, and caves happen to be one of them. Australian-born photographer John Spies, who has been living in northern Thailand for thirty years, spends plenty of time underground exploring caves in his adopted homeland. As a cave explorer, photographer and guide, Spies has visited 85 caves, discovered incredible formations, documented prehistoric cave art, ancient underworld burial grounds, Buddhist temples and strange eyeless forms of life.
See more Spies photos at Red Bubble.
Photo: John Spies / Barcroft Media