Philadelphia is one of my favorite cities, period.  The city is infused with history, is great for pedestrians, has a diverse population and distinctive neighborhoods. The sidewalks range from concrete to brick, wide and narrow, well-kept and not so much.

Center City, walking towards City Hall.
11th Street near Chinatown

South St near 11th St
Sidewalk cafe in Rittenhouse Square with a Parisian vibe
Narrow sidewalks on an narrow street (or is it an alley?) near Fitler Square.
Sidewalk in/near Northern Liberties overgrown with weeds.
Italian Market
The sidewalk on Brandywine Street could use a little sprucing up
Metal poles standing guard in Chinatown

A shady sidewalk near University City