Spencer Tunick is an artist who works all over the world creating installations, which consist of a large number of people posing in the nude in public places.
There’s a lot of effort that goes into an installation because oftentimes the locations Tunick chooses are extremely public, but these places are closed off to the general public while he is working.
This is really awesome, he has people lined up (for light years, it seems) all in the nude! He has worked all over the world, from Brazil to the Netherlands and everywhere in between. You can check out his installations, or get information in how to participate in one, at his website.