Philly is full of tiny residential streets worth a detour. In Old City off 2nd between Market and Arch (across from the Arden Theater), is the cobblestoned Cuthbert Street.
Cuthbert is a mix of multiunit and single family homes.
About the middle of the street are four colonial era houses, perhaps the best examples outside of Elfreth’s Alley.
Just beyond is a house covered in friezes salvaged from local buildings.
That Philly Life: Urban Exploring in Philadelphia 