A view of the New York City skyline from Central Park. | Lindsey Nicholson/UCG/Universal Images Group via Getty Images
New York City is one of the most well-explored places on Earth.
Established nearly four centuries ago by an influential Dutchman, the city has since grown into the largest and most densely populated metropolis in the country, with no fewer than 28,000 people per square mile, or about one person per 1,000 square feet. People are everywhere.
That’s what makes this so astonishing: Scientists believe there are almost certainly hundreds, if not thousands, of undiscovere...
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