15. Marble Caves (Chile)
These caves are located in Patagonia, in the south of Chile. This natural wonder was formed by erosion by water more than 6000 years ago. The caves, which are completely made of marble, change colors depending on the amount of light and the water level. This means you can visit them multiple times and not see the same caves twice.
Take a look at the next page for another incredible place on earth!