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.
Check it out at Colossal