A reader shares a link to a Wired article titled "Maps of Unrealized City Plans Reveal What Might Have Been."
The piece looks at city plans that (thankfully, in some cases) never came to be... all via Andrew Lynch's Tumblr called Hyperreal Cartography & The Unrealized City ... it's loaded with city maps "collected from libraries, municipal archives, and dark corners of the Internet."
Of some local interest... the above plans from the 1950s-1960s ... it was an idea hatched after Robert Moses didn't get his Lower Manhattan Expressway off the ground...
"[T]he Ford Foundation asked architect Paul Rudolph to envision an urban expressway that was better integrated into the city. Rudolph drew a futuristic city with soaring, Space Invader-esque residential towers around the Manhattan and Williamsburg Bridges. The highway would wind beneath a linear city, and modular housing units would be connected by a pod-like monorail system."
Apparently these plans weren't entirely serious, but entertaining nonetheless.
Sort of like the renderings for the Domino Sugar Factory.