Park(ing) Day: Global Movement for More Urban Open Space Favorite 

In 2005, Rebar, a design studio in San Francisco, transformed a single metered parking space into a temporary public park. The area where this two-hour park took place was one that lacked public open space. This was the first Park(ing) Day project.

Park(ing) Day has since become "an annual worldwide event where artists, designers and citizens transform metered parking spots into temporary public parks." Places like Memphis, New York City, and Miami have all taken part in these annual two-hour installations. The next annual worldwide Park(ing)Day will take place September 20th, 2013.

Each project seeks "to provoke a critical examination of the values that generate the form of urban public space."