In Patagonia on the border, between Chile and Argentina, lies a very strange island, made out of marble and surrounded by a lake. The water did its job during the last 6 000 years and created what some people call the most beautiful cave network in the world. The special part is how the marble reflects the water below it. The caves are only accessible via a boat and some of them are submerged into water. This means their ceiling is very close to the surface of the lake and can change colors each season. Very beautiful, not even taking into account the peculiar forms of the caverns themselves.
