Unlike other data centers, this one "has a huge fishtank, artificial waterfalls, simulated daylight, German submarine engines (plus the original sound-horn alarm), a space-themed conference room (where the floor is the surface of the moon) and is located deep within the bedrock of Stockholm city." Click here for first picture in gallery.
And it is real. It is a newly opened high-security data center run by one of Sweden's largest ISPs, located in an old nuclear bunker deep below the bedrock of Stockholm city, sealed off from the world by entrance doors 40 cm thick (almost 16 inches).[via Pingdom]