If looking down from the edge of a cliff or a tall office building gives you a little thrill in the depths of your tummy, then here’s a post that will tie your tummy into knots! We’ve found 30 of the most death-defying photos out there that will test even our most hardened readers.

Having a “head for heights” is great if you’re a thrill seeker or someone who has to work at high altitudes, and some people consider their tolerance for heights to be a source of pride, but many scientists consider the fear of heights to be an advantageous trait (note: this is different from acrophobia, which is an irrational and often extreme fear of heights). The famous “visual cliff” experiment proved that even year-old infants have depth perception and are less likely to approach their mother if they have to cross a glass-covered chasm that may look like a cliff edge to them.

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