The world is increasingly urban. This course will examine the history, growth, treasures, variety, and future of the world's cities - with pertinent illustrations. A large variety will be studied, not just a few. Some of the questions we will address include: What is the appeal of cities? What are their vulnerabilities? What cultural treasures do they house? Why do slums happen and what is life in them like? How does city infrastructure (from sewage to skyscrapers) make cities possible? What will smart cities of the future look like? A typical class will combine lecture (with infographics), video, and focused discussion (~60%, 20%, 20%). At the last session, students who wish will have the opportunity to present the itinerary for a week in a favorite city - one well-loved or yet to be visited. Armchair travelers, world travelers, and those in between are all welcome. Lecture (plus questions). Facilitated Discussion. Viewing Videos.