An industrial juggernaut in the days of Packard and Hudson, Detroit today is home to a new and uniquely 21st-century industry: the art of urban ruin. Detroit has become a mecca for photographers drawn to its blight. Grand theaters molder and collapse in increments, brick by brick. Vast interiors abandoned by humans collect debris and are repopulated by wildlife, with packs of feral dogs so large and so vicious that the U.S. Postal Service has considered ceasing delivery in some parts of Detroit. Trees take root in the most unlikely of places, sprouting from the roofs of abandoned buildings. It …