If you’ve ever been to San Francisco, you’ve probable heard of (or driven on) Lombard Street. It has the reputation of being the curviest street in America.
I’ve actually driven on it several times, but it never occurred to me to look up the satellite view, until I saw it on Google Sightseeing. This photo looks deceptively flat. Lombard has a 27° slope, so it’s actually quite steep. Wikipedia has some nice city-level photos.
The wikipedia article also mentions that, Vermont, another street here in SF has claimed to be the curviest. I haven’t driven on Vermont, and it’s kind of hard to tell from the satellite view. I think I may need to go drive on Vermont, and judge for myself.