Interactive Rollercoaster Sculpture

Created by Heike Mutter and Ulrich Genth in Duisburg, Germany, this $2.75 million project is meant to be enjoyed the way they did it hundreds of years ago: by foot. Topping out at 260ft, 40 people at a time can traverse this interactive sculpture’s 249 steps, but unless you’re a monkey, the loops remain inaccessible.

(photos by Eichental’s flickr, via: photoblog.msnbc)