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At the peak of the industrial revolution, NYC was being built in no small part out of granite that was brought down from the coast of Maine on ships. The water was fairly deep along the rocky coast of Maine, so the ships would get right up close to the rock outcroppings, and load up. There are still rusty iron rings and spikes driven into the rock that the ships would tie off to, and notches like these, carved into the granite to anchor temporary peirs and gangways in place.
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