This lake in the High Tatras Mountains of Slovakia is crystal clear, to the point that those walking on it while it's frozen apear to be magically suspended in air. The video below captures hiker Tomas Nunuk walking on the frozen water. Such transparent ice forms due to a water content with a high level of purity freezing at a slow rate. Coupled with the beautiful surroundings, the lake seems like a frozen paradise! -Via Lost at E Minor