"Emergence of a Modern Metropolis" Philadelphia Walking Tour for 10 by AIA Bookstore & Design Center. Explore Philadelphia's diverse range of architecture from the dawn of the Industrial Revolution to the present and discover the social, economic, and political forces that shaped the modern cityscape. This is a 2-hour walking tour and will be conducted rain or shine. )Guests receive a 20% discount on umbrellas purchased at the AIA book store & design center on the day of your tour.) To find out more, go to http://philadelphiacfa.org/.