While cities had only a small fraction of the population in colonial America, they played a significant role in pre-revolutionary years, and this was certainly true for the largest city in the North American colonies: Philadelphia. Your learners will begin by considering how a city is like an organism, adding to T-charts that list what the main intakes, internal processes, and outputs of a city are and how they are performed. They will then familiarize themselves with the main elements of a city map and "take a walk" through eighteenth century Philadelphia, reading a narrative filled with sensory imagery and valuable historical information.