"Pamukkale (‘cotton castle’ in Turkish) is a natural site in Denizli Province, Turkey, containing hot springs and travertines, terraces of carbonate minerals left by the flowing water. People have bathed in its pools for thousands of years." SO BEAUTIFUL!
Australia's Green Lake in the Hochschwab Mountains is a hiking trail in the Winter. The snow melts in early Summer and creates a completely clear lake. The Lake has a grassy bottom, complete with underwater trails, park benches and bridges. So cool!