roller coaster

This "sculpture" in Duisburg, Germany is designed to like a roller coaster. The catch: It's meant to be walked on. Designed by Heike Mutter und Ulrich Genth, the sculpture's 260 foot heights give passengers plenty to look at, though they have to marvel at the idea of the speed of the coaster at a more sane walker's pace. Check the via link for more!

Exactly what a "4D" roller coaster is is anyone's guess. We're guessing that's some sort of notice for how much you're going to throw up while riding this thing.