SFStreets: History of San Francisco place names

I worked on a project long time ago similar to this. I had to dig up old maps from major public libraries across a handful of cities and overlay them on top of modern maps using key historical landmarks and geographical features. It’s amazing how cities evolve and transform over time. I think what would be cool is if someone could build a street-level time capsule of places like New York. Perhaps monthly or even daily.

There was/is a website that's a bit like google maps, but with historical map overlays. I cannot for the life of me remember the name.