Anyone who has ever traveled to Manhattan knows that it has characteristic odor. The odor is so distinctive in fact that they've apparently found a way to bottle it and diffuse it into the air in the New York, New York hotel and casino in Las Vegas.
For those who have not experienced it themselves, I can only describe it as a cross between sauerkraut, saltwater, and sewage, though the combination is not as offensive to the nose as that might sound.
What causes this odor in NYC? I have no clue. Maybe it really is sauerkraut, saltwater and sewage?