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"Austria'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." -must go here

Gruner See (Green Lake) is a lake in Styria, Austria known for its shimmering, emerald-green hue and its fluctuating depth throughout the year, at times leaving a park completely submerged in it. The site has proven to be an attraction for divers, inviting them to plunge in and explore the spectacular underwater park, fully adorned with a bridge and a bench. There are even submerged trees in the crystal-clear waters that gives it a magical look.