Donn D.
Yelp
While visiting a buddy in Springfield he took me to this place as his companies data center is housed here. It's a secure facility underground, perfect for storing data related equipment due to it's controlled and constant temperatures. The place is absolutely amazing. They have manufacturing facilities, storage facilities, and of course their own train, because you know, they can.
His data center was protected so he couldn't get me in to look at that, so this is more of a touristy review rather than an actual user review. But I've got to say it's freakin amazing, and if you've never had the chance to get into a mine that's been converted into commercial usage I'd highly recommend stopping by here if you can wrangle a pass!