7 Mind-Blowing Structures Built In Secret

Humans build incredible things. Chances are good that you passed something on your way to work this morning that would make our ancestors accuse someone of witchcraft. But we never stop to wonder what awe-inspiring creation someone could be producing right under our noses, because why would anyone build something impressive and keep it a secret? Plenty of (usually insane) reasons, it turns out.

 
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