A one block portion of Lombard Street between Hyde and Leavenworth Streets in San Francisco, California has earned the name, "The Crookedest Street in the World." Indeed, constructed in the 1920s as a way to deal with the insane 45º slope on Russian Hill (A less steep, but still the steepest street in San Francisco, Filbert Street is 2 blocks up; peer down, and you'll be glad that there are switchbacks). This section of Lombard Street consists of 8 switchbacks along a beautifully landscaped hillside.
For those who do not want to deal with the sharp turns though, or irate drivers while trying to negotiate them, one might want to try the 2 stairs on either side of this landmark road. Don't worry, they're straight.
Oh...at least this section of Lombard Street is one way.