Bitcoin mining is now a serious and huge business:...
Bitcoin mining is now a serious and huge business: $2M+ in revenue per day at today's valuation http://t.co/xnPykwMzPC
December 22, 2013
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On the flat lava plain of Reykjanesbaer, Iceland, near the Arctic Circle, you can find the mines of Bitcoin. To get there, you pass through a fortified gate and enter a featureless yellow building. After checking in with a guard behind bulletproof glass, you face four more security checkpoints, including a so-called man trap that allows passage only after the door behind you has shut.
http://mobile.nytimes.com/blogs/dealbook/2013/12/21/into-the-bitcoin-mines/?_r=0