Microsoft's newest data-center is under the sea off the coast of Scotland's Orkney islands. It has 12 racks with 64 servers holding over 25 petrabytes.
They have also installed two live web-cams. Check out the link below. Simply scroll past the Project Nantick banner to see the live feed. The quality isn't great but there is lots of activity.

https://natick.research.microsoft.com/