In this episode, Stacy learns about Elfreth's Alley, the nation's oldest residential street, which is located in Philadelphia. She chats with Ted Maust, director of the Elfreth's Alley Museum, and long-time residents of the alley, Rob and Sue Kettell.  Also, Bill from Enon Hall is back to help Stacy answer a listener question about adding modern amenities, such as kitchens and baths, into old houses.