World Naked Bike Ride London photo
Like Critical Mass, the World Naked Bike Ride (WNBR) is gaining global reach. The London ride pictured above in 2008 is where it all began six years ago, and is the biggest ride with more than 1,000 riders, but the WNBR continues to grow in both number of cities participating and number riders willing to bare all. This year, over 10,000 are expected in more than 70 cities, mostly over the weekend of June 12, 2009.
Photo via Paul-in-London @ flickr.