mecca's tubes

With millions of worshippers visiting Mecca every year, the Saudi government needed to think of a way in which to deal with the crowds and the material consequences of that many people, namely their rubbish. Scattered around the Hajj mosque, visitors will find 400 little holes where they can deposit their trash and have it whisked away by vacuum, underneath the holy site. Read more in WIRED.

Thanks Jess for sending me this link to this fascinating use of tubes!
Image used under Creative Commons lisence, from Mohd Rasim's Flikr page.