Located in central Stockholm is the headquarters of Bahnhof, a Swedish Internet Service Provider and host with one of the coolest data centers on the planet. It gained notoriety a few years back as the former home of Wikileaks. (and if I’m not wrong they host also part of The Pirate Bay <- but this may be a bullshit, don't know.) Named Pionen White Mountains, it is located 30 meters under the granite rocks of the Vita Berg Park in Stockholm. The location was a former nuclear bunker and command center during the Cold War. It took more than two years to blast out the extra space that Bahnhof needed to fit its backup generators and server racks into the caves. The total space comprises roughly 1,200 square meters and there were several design challenges.