The Center offers walking tours, exhibitions, lectures, and workshops on architecture, urban planning, and design. Browse our selection of unique designer gifts and books at the AIA Bookstore and Design Center, located in the Center. We are also home to the Philadelphia chapter of the AIA and the Community Design Collaborative. Emergence of a Modern Metropolis Walking Tour: Explore the social, economic, and political forces that helped transform Philadelphia from an engine of industry to a 21st Century capital of business and culture. Featuring the architecture and urban design on the city, this two-hour walking tour will introduce you to the Modern Metropolis of Philadelphia.