Unbelievable....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. So cool!
Argentinian artist Leandro Erlich created this fake pool called The Swimming Pool, for The 21st Century Museum of Contemporary Art in Kanazawa, Japan. Leandro put two clear acrylic glasses about a foot apart and filled the space in between with water. The top surface is also filled with about 4 to 5 inches of water so that it looks like a realistic pool.