The City of Brotherly Love, the Liberty Bell and The Cheesesteak.
I, for one, am most looking forward to the latter of the three...
The cheesesteak, known outside the Philadelphia, Pennsylvania area as the Philadelphia cheesesteak, Philly cheesesteak, or steak and cheese is a sandwich made with thinly sliced pieces of steak and melted cheese on a long roll. A cheesesteak without cheese is locally called a steak sandwich, or a Philly Steak in other parts of the country. It was invented in the city in 1930 and considered to be a city icon along with other foods such as Tastykakes, water ice, the Philadelphia soft pretzel, hoagies, and scrapple*.
Fortunately I'll be heading to Philly with a friendly guide who knows some good places to get a decent cheesesteak. We'll have to try several spots to get a suitable sampling.
Image from http://en.wikipedia.org/wiki/Cheesesteak
*Scrapple is a savory mush in which cornmeal and flour, often buckwheat flour, are simmered with pork scraps and trimmings, then formed into a loaf.