Apparently there are inner-city areas in Detroit that are being reclaimed by nature, because homes and entire neighbourhoods have been abandoned for years. As they get torn down or gutted (but not replaced), trees take over. Neglected and empty skyscrapers and buildings downtown have trees growing on roofs and pigeons taking over inside. The images are truly striking:
Meanwhile, the suburbs and exurbs keep growing and sprawling out away from the city -- and all the people moving/living out there have to drive to get anywhere. There's something so Mad Max about this story, but the apocalypse seems to be happening so slowly.