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Elfreth39s Alley Museum Three hundred years of history on one residential street. Elfreths Alley is one of the oldest continuously inhabited residential streets in the United States. Located in Old City Philadelphia Elfreths Alley dates back to 1703 and is an exceptional collection of early American structures built between 1720 and 1836. Most of the homes are privately owned residences but 124 and 126 are the Elfreths Alley Museum run by the Elfreths Alley Association.