In Dante's Wake is a journey in poetry through the moral universe, from blinkered evil to heaven's networks by way of the muddled-up places in between.
Among The Lost, the second volume of the trilogy, visits the City of Purgatory. Seven hundred years ago, it was a terraced mountain on which the souls of the saved paid for their sins on the way to heaven, but that was bulldozed long ago. Now it's a Rust Belt city full of confusion, conflict, and poverty, through which all roads lead to who knows where.
Order through your local bookseller, or from Amazon.