Background: This small cobblestone side street can be found in Pittsburgh's Beechview neighborhood."
How It's Unique: Pittsburgh's Department of Public Works confirms that this short road has a 37 percent grade, which means that it ascends 37 feet in elevation for every 100 horizontal feet it travels. Fortunately, for pedestrians, city planners included a flight of steps along the side of the road. "You wouldn't specify this road as a modern design; these usually exist for historical reasons," Mahmassani says. Canton Avenue has an ongoing feud with New Zealand's Baldwin Street (which unconfirmed reports claim has a grade anywhere between 35 and 38 percent) for being the world's steepest drivable street.
Excerpt from http://www.popularmechanics.com/technology/engineering/architecture/4338387
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