5 years in the making, $1,000,000,000 construction cost. $2,000,000 anual maintenance and 66 million gallons of saltwater!
Named "The BiggestPool " in the world by the Guiness Book of Records, located somewhere in Chile. It also boasts a computer controlled suction and filtration system that to keep fresh seawater in permanent circulation. And it does no harm to the sea. The natural heat from the sun gives it a warm temperature of 26 degrees celcius. 9 degrees warmer than the sea beside it.