DON'T. LOOK. DOWN.

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DON'T. LOOK. DOWN.
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According to staff at Willis Tower, the cracked portion you see here was a part of the safety seal of the observation platform and not the glass itself. Still, that's the last thing you want to see when you're suspended that high in the air.

This is What it Looks Like to Climb the Second Highest Tower in the World

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This is What it Looks Like to Climb the Second Highest Tower in the World
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I'll give you exactly one guess to figure out where these daring climbers come from:



If you said Russia, you've been paying attention to the internet! Congrats!