Quote:
Originally posted by arz
The Flavian Amphitheater (which is commonly called the "Colosseum")
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Given that one example, I'd say NYC would be around for several thousand years as a recognizable city and wouldn't return completely to a site with no recognizable features of civilization for 100 000 years (everything completely decomposed).
But that's just a guess.
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Keep in mind that the Colloseum is built of solid stone, designed to stay together without cement. As such, it will last longer than anything built these days. Remember the small number of recognizable pieces in the WTC rubble. But the sheer size and number of buildings in NYC may offset that a bit.