Based on the maps, how does Boston differ from Philadelphia?

Boston was founded along a body of water, but Philadelphia was not.
Boston was built on flat land, unlike Philadelphia.
Boston was designed with spaces for parks, but Philadelphia was not.
Boston was built without use of the grid system, unlike Philadelphia.

Boston differs from Philadelphia in that it was founded along a body of water, built on flat land, designed with spaces for parks, and not built using the grid system. Philadelphia, on the other hand, was not founded along a body of water, built with the grid system, and was not designed with as many park spaces.