From Wikipedia:Elfreth's Alley is a street in Philadelphia which is referred to as "Our nation's oldest residential street," dating to 1702.As of 2012, there are 32 houses on the street, which were built between 1728 and 1836. The Elfreth's Alley Museum is located at #124 and 126. The alley is a National Historic Landmark. Located in the Old City neighborhood, it is between North 2nd Street and North Front Street, in the block between Arch and Race Streets. https://en.wikipedia.org/wiki/Elfreth%27s_Alley