Mount Thor in Canada's remote Nunavut territory isn't your average mountain—it holds the record for the planet's most extreme vertical drop, with a sheer cliff face that actually leans outward at a stomach-churning 15-degree angle. Imagine looking down from a 4,000-foot skyscraper that's slowly tipping over, and you'll get the idea.

Editor’s Note: While this isn't exactly breaking news (the mountain's been there for millions of years), it's a jaw-dropping reminder of how extreme our planet's natural landscapes can be. For adventurers, it's either the ultimate challenge or a hard pass—no in-between. For the rest of us? Pure armchair adrenaline.