Stairways are one of humankind’s oldest inventions, a simple method for getting up a slope without sliding back down again. But of course… the bigger the slope, the more stairs needed. And there are some pretty big slopes out there!

For those overcome by a sense of adventure, here are nine of the world’s most heart-stopping stairways that may just give you vertigo. Whatever you do, don’t look down…

View the original video here.

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