Melissani Cave, on Kefalonia Island in Greece, features a sky-blue lake within the cave. The lake is shallow and clear, and is covered with stones at the bottom. The cave was rediscovered in (In Greek mythology, Melissani was the cave of the nymphs.
The trailhead to this easy hike is located just outside of Page, Arizona. It overlooks one of the most spectacular views on the Colorado River, 4 miles south of the Glen Canyon Dam, and 7 miles north of mile zero of the Grand Canyon.
Lake Retba, or as the French refer to it Lac Rose, is situated north of the Cap Vert Peninsula in Senegal, northeast of Dakar. The lake's harmless bacteria makes it pink while it's high salt content makes in easy to float on