Lake Baikal

Lake Baikal, situated in southeastern Siberia in Russia, isn't just the oldest freshwater lake on Earth, it's also one of the largest, holding just about one-fifth of the world's freshwater. As if that wasn't a cool enough fact, wait until you see what happens when that water freezes. During the winter months, from January to May, the 25-million-year-old lake turns into an incredible sight that has to be seen to be believed. While it freezes over much like any other lake in the cold weather, it hardens so clear and crisp that when you walk out onto the surface of the ice, you can peer straight down and see over 150 feel below from the surface, you can see an astounding 130 feet below you.  Thanks to a combination of the astoundingly clear ice and a perfect storm of temperature, sun, and wind that occurs in March, "hummocks" begin to form, creating giant, turquoise ice shards, like huge chunks of blue rock candy (or Walter White's meth) stretching into the sky.