#14 The pool of San Alfonso del Mar, Algarrobo, Chile
San Alfonso del Mar, located in Algarrobo, Chile, is home to the largest crystal-clear pool in the world, according to Guinness World Records. Spanning over 900 meters, the pool is filled with about 250 million liters of treated seawater. Situated directly on the beachfront, the pool’s waters remain remarkably clear and turquoise, thanks to advanced filtration technology. During the summer, the water temperature is approximately nine degrees warmer than the ocean. The pool’s vast size provides ample space for a wide range of water activities such as diving, sailing, and kayaking.