Philadelphia is a proper noun. Philadelphia is (1) the largest city in Pennsylvania; located in the southeastern part of the state on the Delaware river; site of Independence Hall where the Declaration of Independence and the Constitution were signed; site of the University of Pennsylvania.
The Quisto editorial staff has evaluated these websites and placed them in the Philadelphia information category.
Frommer's Destinations - Philadelphia
This Philadelphia travel guide features trip planning, accommodations, dining, and attractions information.
Lonely Planet - Philadelphia
This Philadelphia, Pennsylvania destination guide features information about events, attractions, history, and transportation.