The story of the great flood: http://www.amazon.com/Dark-Water-Disaster-Redemption-Florence/dp/0767926498/ref=sr_1_1?ie=UTF8&qid=1330542542&sr=8-1

When I was there last year, I kept seeing signs fifteen feet up on walls and churches saying that the water'd gotten to that height - I'd read the book before going, so it was fascinating to see how the flood had impacted the city. They're *still* working on some of the artworks, too.