Lombard's crooked street is a postcard-perfect image that represents San Francisco around the world. But what exactly is this attraction and what does it have to offer the San Francisco visitor?Lombard Street in San Francisco is one of America's crookedest streets. The steep, hilly street was created with sharp curves to switchback down the one-way hill past beautiful Victorian mansions. If not for the byzantine curves, easing out this treacherous slope, people could be killed rolling down. For an idea of how steep this street really is, go two blocks up, to Filbert Street and peer down over the ridge. Lombard is even steeper.