This Month in Photo of the Day: City Pictures

New York's Empire State Building gleams in the windows of an architectural firm in this photo from a May 2009 National Geographic story on living roofs. Blossoming in cities around the world, overhead gardens like this one take advantage of acres of potential green space.

See more pictures from the May 2009 feature story "Up on the Roof."

Click through Diane Cook and Len Jenshel's photos of the Manhattan High Line »
Download the New York City guide from National Geographic »