Bahnof Data Centre. The ISP has its offices in the Pionen White Mountains underground bomb shelter and military bunker, south of Stockholm. The project entailed blasting out more than 4 000 cubic metres of rock to create the 1 200 square metres that Bahnhof needed. Located 30 metres below ground and shielded by 16-inch-thick metal doors, Pionen hosts server halls and offices.
A few years ago, it was briefly the most famous data centre in the planet – home to WikiLeaks.