You either love it or hate it, but nothing says New York like the street grid of Manhattan. Created in 1811 by a three-man commission featuring headstrong Founding Father Gouverneur Morris, the plan called for a dozen parallel avenues crossing at right angles with many dozens of parallel streets in an unbroken grid. Hills and valleys, streams and ponds, forests and swamps were invisible to the grid; so too were country villages, roads, farms, and...