Don't look now but you're more than 1,000 feet off the ground with nothing but a glass floor between you and the bustling streets of Toronto below. Not for the faint of heart, the between-the-toes view from the top of the CN Tower can reduce two perfectly serviceable legs to spaghetti.

This architectural exclamation mark on Toronto's skyline is the world's tallest free-standing structure. But the real high drama is playing itself out in the city beneath you. So if you're looking for the action, you've got to hit the streets (preferably via the elevator).