South Philadelphia's Italian Market is the oldest continuously operating open air market in the United States, a surviving enclave of the American immigrant experience. While most neighborhoods undergo dramatic change after more than a century, the distinct character of the Italian Market has survived since it opened in 1891.

A new episode of PBS' "No Passport Required" dives into the history and flavors of South Philly's Italian culinary scene. Host Marcus Samuelsson, an Ethiopian-Swedish chef best known for Harlem's Red Rooster, takes viewers through a variety of restaurants and meals, from the historic Ralph's to the revived members-only Polizzi Social Club.