Cities are one of the most conspicuous features on our planet. They are so much the bustling centers of commerce, industry, politics, communication and creativity, we can hardly imagine a world without them. Yet there was such a time, and program ten begins by exploring what it was that led people to begin living in larger, concentrated settlements. We then explore the major features and spatial pattern of cities from ancient times to the 19th century. This survey includes the cities of the hydraulic civilizations, Greece, Rome, Medieval and Renaissance Europe, and the Industrial Revolution.