here, but I've included an image to provide a flavor of the program (the image is actually not from the slide show at Fast Company but from the Norwegian tourism website). This sure makes me way want to visit these places in Norway!
I can imagine something like this even in an urban setting like the Wissahickon area of Fairmount Park, along the Delaware or Schuykill, or some of the wilder areas of the New York Botanical Garden in the Bronx. Jody Pinto's Fingerspan in the Wissahickon (commissioned by the Fairmount Park Art Association) and the Morris Arboretum's new "Out on a Limb" Canopy Walk come closest to this in Philadelphia. Here is a picture of the Canopy Walk, which was designed by Metcalfe Architecture & Design, and recently won a 2010 Architectural Excellence Award from AIA Philadelphia :