You know it’s often that we have unwanted structural elements and then just left it there. So what’s next? this is when Architects coming putting their artistic skills into something useful. How about an abandon rollercoaster track into becoming a walkway? Moments when Architects doing something out of typology! Credits to Treehugger.
It is 21 meters (69 feet) high, although I am not quite sure how you do that top loop.
The designers describe it:
The curved flight of stairs inscribes like a signature on the landscape and recruits the nimbus of the classical roller coaster. Having a closer look, the public is disappointed in a disarming way. The visitor climbs on foot via differently steep steps the roller-coaster-sculpture. So the sculpture subtly and ironically plays with the dialectic of promise and disappointment, mobility and standstill. Visitors happen to briefly meet with oncoming visitors on the steep and about 1m (3′) wide corridors.
There are LEDs embedded in the handrails to make it accessible at night, and beautiful to look at.
It is on a built-up “magic mountain” and provides an impressive view of the Rhine. More at Heike Mutter & Ulrich Genth
And if you don’t want to walk, there is always the TreeHugger-Style Roller Coaster in Japan: It’s Pedal Powered.