Way back in the day—like really way back, 400 million years ago—Manhattan was covered in a different kind of towering behemoth: Mountains, as tall as the Alps. And though those peaks are long gone, it turns out that we owe a lot to them. In fact, they're the foundation upon which NYC's skyscrapers are built.
from Gizmodo http://ift.tt/1qBC02J
via Gizmodo
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