Over one kilometer in length, 8 hectares in surface area and 2.5 million liters of water. Too big to picture? Let's put it this way; The size of this pool is equivalent to 6,000 standard-size 8-meter long swimming pools. This one took five years to build, cost nearly $2 billion and has an annual maintenance bill of $4 million. The monster pool uses a computer- controlled suction and filtration system to keep fresh seawater in permanent circulation. The star of the show is the man-made lagoon in San Alfonso del Mar resort located in seaside Algarrobo, Chile.

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