Kelimutu is a volcanic peak in Indonesia that has three crater lakes, each displaying water with a different color! The Lake of Old People (Tiwu Ata Mbupu) is blue, the Lake of Young Men and Maidens (Tiwu Nuwa Muri Koo Fai) is green, and the Enchanted Lake (Tiwu Ata Polo) is a dark murky color that sometimes appears red. The exact color of all three lakes changes somewhat, and the tints are thought to be the result of gasses released from the earth underneath, interacting with the ecosystem in different ways for each crater. Each lake has its own spiritual meaning as well. read about them and see more pictures at Kuriositas. Link
(Image credit: Flickr user whl.travel)
http://www.neatorama.com/2007/05/21/the-strangest-disaster-of-the-20th-century/