In its industrial era, Pittsburgh working class often lived on the tops of the hills, commuting down to the factories on the riverbanks via extremely large sets of stairs. Hidden gems of the city's pragmatic past, there are 712 sets of stairs (totaling 4.5 vertical miles) in the city today. During some of my outdoor stair workouts, I've encountered some intriguing discoveries. Many of these steps are considered on paper as true streets. Don't try to mapquest on the South Side Slopes, as the software engine may lead your car to a left turn down a staircase. I even stumbled upon the occasional house whose only access is the stairs--no alley, no street--just the stairs (imagine carrying groceries).
This photo above is Yard Way, which has 317 stairs.