This is one of the most amazing buildings you'll ever see — or not see. It's made entirely out of water, showering down at 30,000 liters per minute. Take a look at these pictures.
Created by London design firm Random International at World Heritage Zollverein, this water building is called Instant Structure. The designers call it "a monolithic form, an ephemeral tower that appears and disappears instantaneously."
Read more on the Random International website.