The world's coolest data centers

Data centers gobble up energy and generate heat, but here are some data centers that try to do it with their own flair

Pionen Data Center, Sweden: Located in a Cold War era defense bunker, this data center could take a hit from an H-bomb and keep on ticking. It takes advantage of some other military technology, enlisting dual submarine engines to power backup-generators in case the conventional power grid fails. To make the working day bearable in a granite cave 100 feet below the streets of Stockholm, the facility has greenhouses, an artificial waterfall and a 686-gallon salt-water fish tank.

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