For us NYC history nerds, the New York Public Library‘s digital archive is one of the most valuable tools. We can search historic photos by address, building name, or neighborhood. This can get a little tedious, though, especially if a location no longer exists or we don’t know the exact street number. But sleuthing for vintage pictures just got a whole lot easier thanks to a new mapping tool from the library’s NYPL Labs team. OldNYC is an interactive map that features red dots on every location for which the collection has photos from the 1870s through the 1970s and lets you explore and interact with the images.