In case you were wondering, yes, The New York Public Library (NYPL) has a YouTube channel, and the “Treasures of The New York Public Library” playlist is an amazing resource for all that obscure archival footage you never knew you were looking for. Start here with “The New York World’s Fair, 1939-40” and then travel to Manhattan’s Sputyen Duyvil Creek in “Mapping the World” with curator’s from the Map Division.