4. Captain William Moore Bridge, Alaska
Named for Captain William Moore, “a pilot, prospector, packer, trader and riverboat captain,” the bridge runs 110 feet over Moore Creek Gorge … and an active fault line. As a result of its location, the engineers who designed the bridge only anchored one side of the thing so that in the event of a ground shift, the bridge isn’t torn in half. How comforting.

5. Sidu River Bridge, Hubei Province, China
Let’s start here: the Sidu River Bridge is the current record holder for highest bridge in the world, “which hangs over 1,600 vertigo-inducing feet above a canyon floor, connecting what amounts to two mountaintops.” At just under a mile, the expanse between the two sides of the bridge was, “so long that the builders had to use a rocket to string the first pilot line across the gap.” If you have an innate fear of heights, you just might opt to take the long way around.

6. Hussaini Hanging Bridge, Pakistan
And you think your daily commute is stressful. How would you like to traverse this wildly swaying rickety footbridge across the raging Hunza River every day? It looks as if any of those twigs or ropes could snap at any moment, and leaping between the broken planks is a life-or-death risk.
