I know it was a summer Olympics, but everything they built in London is still being used. and the Athletes village is now being turned into moderately priced city centre housing, which is smart.
Unfortunately I still consider the Olympics to be both a wonderful spectacular celebration, and a colossal waste of money and resources. The London 2012 turned into pretty much a show for the commercial sponsors, because you could not but any food or drink in an Olympic venue which wasn't from a sponsor - and that left everyone with remarkably little choice in this city of culture.
the slides were rather beautiful and depressing.