Seattle nude cyclists observe WNBR 2011

With a 3-hour nude bike ride through the city last Saturday, Seattle, Washington, has joined the growing number of cities to cycle naked in observance of this year's World Naked Bike Ride event.

In the last two months, cities in the UK, Spain, U.S., Chile, Mexico, and Canada have seen participants bike naked to promote environmentally friendly transportation, raise awareness on biker-friendly urban planning, and protest fossil-fuel use.

The Seattle event drew nearly three dozen riders, including one naked man on roller blades. The group rode through the busiest parts of town, including the Pike Place Farmer's Market and the fashionable Capitol Hill neighborhood, on a warm day when many were out on the streets.

The WNBR riders also stopped for a quick rinse in the International Fountain, a large recreational area that is part of the Seattle Center, home to the Space Needle and site of the 1962 World's Fair.

The event ended at the Olympic Sculpture Park with a group skinny dip in Puget Sound.

Seattle's WNBR ride takes place a month later than many cities to take advantage of the July weather. Nakedism founder Bucephalus joined in the ride.