The world's coolest data centers

Lakeside Technology Center, Chicago: Formerly the printing facility for the Sears catalogue, this building has been converted to a 1.1 million square foot data center. The reinforced floors, tall ceilings and high-capacity air ducts needed to accommodate printing presses proved suitable for data center equipment and cooling needs as well. Now a telecom hotel leased to Equinix and Global Center, the building has room for 210,000 computer servers and stores 300,000 gallons of fuel to for backup generators.