Design of Buildings and Cityscape
Climbing around and over buildings is a huge part of the game play in all of the Assassin's Creed games. Each city used as a setting is meant to have a distinct atmosphere.
“Ubisoft has established something of a reputation in its games for capturing accurately the atmosphere of different historic periods and places, and for Assassin’s Creed III, their creative directors consulted historians, maps, and other resources, to build extraordinarily-exact replicas.”
Dr. Nathaniel Sheidley, article to the Bostonian Society of Boston, MA
Above is a painting of the Boston harbor called Vue de Boston vers le Café du Port by Franz Habermann from 1778 (right) and an in-game screenshot of the harbor from Assassin's Creed III.