Everyone and their dog knows about Park Hill in Sheffield - a huge sprawling complex of flats, concrete lines, streets in the sky, urban decay and so on. But Sheffield has embraced odd, "ugly" architecture wholeheartedly over the years, leaving it as a living museum to various styles not very popular elsewhere.
One of those is Modernism, which includes everything from the University Arts Tower (with its paternoster lifts), the Moorfoot Building (resembling a giant Aztec stepped pyramid), the cold and simple Crucible Theatre (home of world snooker), and the uber-brutalist Moore Street electricity substation.
What do these buildings say about Sheffield - where its come from and where its going to - and what do they say about us?
So let's walk around Sheffield looking at mad buildings and pretend we're having a serious think about cities, architecture, nature and the human condition.