Google datacenter - Hamina, Finland
Facebook, Google and Microsoft each rely on a global network of datacenters - vast warehouses stacked with tens of thousands of servers and hundreds of miles of cable.
These highly automated, maximum security facilities are generally kept away from the prying eyes of the public, but every so often the tech giants lift the lid on what goes on inside.
Here's a look inside some of the datacenters used by the big three, offering a peek at the sheer scale of their infrastructure.
Nick Heath is chief reporter for TechRepublic. He writes about the technology that IT decision makers need to know about, and the latest happenings in the European tech scene.