From Microsoft to Google, Time Warner to Hitachi’s new “Green” data center in Yokohama, Japan, companies have massive data centers that work behind the scenes to deliver the world with the fastest, most energy efficient data processing systems. IBM, for example, operates eight million square feet of data center space on six different continents. Here are a few incredible portraits of some of the world’s largest data centers. Some show simplicity, while others show just how complex and congested some centers can become.