As part of the 2012 Archstoyanie festival in Nikola-Lenivets, Russia (from what I can tell it’s kind of like a small version of Burning Man but… with architecture and forests) design firm Salto created this gargantuan trampoline installation called Fast Track. Measuring nearly 170 ft. (51 meters) the bouncy road is nearly the length of a city block. According to the designers:
“Fast track” is a integral part of park infrastructure, it is a road and an installation at the same time. It challenges the concept of infrastructure that only focuses on technical and functional aspects and tends to be ignorant to its surroundings. “Fast track” is an attempt to create intelligent infrastructure that is emotional and corresponds to the local context. It gives the user a different experience of moving and percieving the environment.
Update: Now with video. (thnx, paul)