5. New York Public Library’s NYC Space/Time Directory

Green Book Map from NYPLMap 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.