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When was the last time you were in a hotel swimming pool so massive, that you could sail boats in it?

The enormous man-made pool, set along the coastline at Chile’s San Alfonso del Mar Resort, is larger than 20 Olympic-size pools and holds a whopping 66 million gallons of water.

Not only is the pool long, it’s a little deep – it holds the Guinness World Record for being the world’s deepest (115 feet). It took nearly five years to build and is said to have set developers back as much as $1.5 Billion (£1billion)… with up keep costs being a cool $3 million (£2 million) annually.

It uses a computer-controlled suction and filtration system to suck water in from the ocean at one end and pump it out at the other, while the sun warms it to 26C – nine degrees higher than the sea.

[Cheers dailymail]