This gigantic $1.6 billion concrete-lined lagoon on the coast of Chile holds the distinction of being the world’s largest man-made pool (in addition to the most expensive). Over 1 kilometer long and 115 feet deep in parts, it borders the Pacific on one side and a cluster of high-end condominiums on the other. Seawater is sucked in from the ocean via complex circulation pumps, while it is kept impossibly clean through a technologically advanced filtration system and traditional pool cleaners (men can be seen brushing the pool-sides for algae in the early morning hours). Private access to the facility limits the patrons to property owners and their guests, although intrepid travelers can find locals online who sublet their pool-front condominiums to vacationing foreigners. Keep in mind the pool is only marginally warmer than the ocean which feeds it, so time your trip during the Southern Hemisphere’s summer months (November-February).
Read more: http://wandermelon.com/2012/07/25/the-five-top-swimming-pools-in-the-world/#ixzz3Zhkar7Gh