People have climbing up mountains and scaling their faces for a very long time. But the extreme walkways in this collection are enough to give even seasoned hikers a bad case of vertigo. Spectacular photos and personal (we like to call them “survivor”) videos take us on a terrifying trip along places like a wicked-high 12-inch-wide “road” in China and along a treacherous cliff-side path in Spain with sections simply crumbled away (and no handrails!). Another place where the sensible refuse to stroll is a “walkway” in Utah with a teeth-clenching 2,000-foot drop on both sides. You have to see that one to believe it.