New York has the worst subway map in the world. Instead of using London Underground-inspired abstract maps like a normal metropolis, the locals prefer a more geographically-faithful "spaghetti" rendering, thereby making wayfinding a pain for tourists. But it's not as if improvements haven't been attempted: New York's peculiar layout, and the density of its downtown lines, tend to make minimalist maps confusing in other ways. Mapmaker Max Roberts, however, has created this incredible "circular map", which uses a Tube-like style but with the 90- and 45-degree angles ditched in favor of radial lines emanating from the Upper Bay.
Look, No Grid! NYC Reimagined As A Circular Metropolis [Fast Co]
P.S. Roberts tried the same thing with the London map, but to my eye it only introduces unnecessary decompression to the original's optimized snarl.