http://www.skepticality.com/neil-degrasse-tyson/
that I'm sure his tongue is firmly in his cheek when he writes of future civilizations speculating on cultural reasons for Manhattan's grid alignment.
By the way, I especially like the last paragraph of the submitted post, which assumes a readership mostly in the temperate zone of the Northern Hemisphere: "While we are on the subject, when viewed from all latitudes north of the Tropic of Cancer (23.5 degrees north latitude), the Sun always rises at an angle up and to the right, and sets and an angle down and to the right. That's how you can spot a faked sunrise in a movie: it moves up and to the left. Filmmakers are not typically awake in the morning hours to film an actual sunrise, so they film a sunset instead, and then time-reverse it, thinking nobody will notice."