Sunset St. was what built my leg muscles.  I had to zig zag it on my - 1 speed bike at first.

going straight up in a line was a Rocky dancing on top of the steppe moment for me - but I could turn around and probably see for 30 miles.

I ran up it for conditioning as well.

I would crawl it now & pray I’d make it to the top.

I read the steepest hill in the US was in Pittsburg ...

I am not sure.