Portrait of a City review – master photographers capture the US cityscape in all its grime, grit and glory

Dulwich Picture Gallery, London Era-defining photographs from the likes of Alfred Stieglitz, Saul Leiter and Dorothea Lange showcase the urban landscape, from midnight crime scenes to gloomy corridors In pictures: Great American cities in pictures This – only the second photography exhibition in Dulwich Picture Gallery’s history – is a quietly contemplative but gripping show that traces two…