Ever feel like you're on top of the world?

Now you really can be. 

Imagine hanging from a glass cube on top of Sears Tower or dangling from a Ferris wheel 1,493 feet in the air. Sound scary? For those brave enough to reach new heights, we’ve pulled together a list of the world’s most harrowing observation points.

So pack your parachute, we’re going up, up and away.