The Blue lake Cave is found in Mato Grosso do Sul region in Brazil and the little town of Bonito boasts many such caves. This is a natural monument and its interior is formed by stalactics, stalagmites and of course the beautiful lake. The Blue Lake Cave has a variety of geological formations but it’s the color of the deep blue water that gives it its spectacular view.
Blue Lake Cave in Brazil
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Geosmin.... 
This place looks incredible! I wonder what makes it so blue. Is there wildlife as well or does it have to do with something in the chemicals in the water?
It is not because of chemicals. The water is blue itself naturally.