5. New York Public Library’s NYC Space/Time Directory
Map courtesy NYPL
This vast and seemingly endless database brought to you by the New York Public Library is like brain food for map nerds. Really a whole amalgamation of resources including historical maps, data sets and photographs, scholars, students, librarians, and enthusiasts are subsequently using the info in real-time projects.
Take a deep dive into 19th century hand-drawn maps, or navigate through important artifacts related to the Green Book, a 20th century travel guide which black Americans relied on while road-tripping through the country during the pre-Civil Rights era.