Marble Caves - Chile
For over thousands of years, the waters of General Carrera Lake and the Patagonian wind have moulded the marbles here, creating a series of tunnels and caves, which are breathtaking. To get there you have to reach the village of Puerto Rio Tranquilo in Chile and hire a boat, as that is the only way to get to them.
Hey, I have a picture almost the same as yours here! This marble cave and the whole region are simply amazing! You remind me to dig out my photos from those travels. =)