No People

Here's a really interesting article on what would happen to the Manhattan if all the people suddenly vanished. Without pumps to remove the water, the subways would flood within two days (Manhattan has 13 natural springs and was covered in rivers when initially settled). Within a few decades. The buildings and subways, after being subjected to the freezing and thawing process, would all collapse within a few years, and vegetation would push out all the concrete. Long story short, New York would return to mature forest within 50 years.