Marble Caves of Patagonia in Chile – Lake Carrera. The lake is on the border of Argentina and Chile, and the caves are located on the side of Chile. The caves are the three main grotto: Chapel (La capillaries), Church (El Catedral) and Cave (Cueva).
The Blue Grotto, Capri Italy. One of the most amazing thing I've seen. The sunlight shines in a cave with a small opening, reflects off the white sand then up thru the water Explore the World with Travel Nerd Nici, one Country at a Time.