Rollercoaster visible from space

So we've all heard about the Great Wall, and know a little bit about it. What you didn't know is that there is a rollercoaster attached to the side of the wall. If hiking a world treasure isn't extreme enough for you, or if you're simply too lazy to walk all the way back to the starting point, you can hop on the coaster. Or it's possible that the coaster was here first and they built the wall around it.