I find systems of systems to be generally fascinating. I was lucky enough today to find Urban Omnibus (a project by the Architectural League of New York) which has a series called "City of Systems" that covers various systems in New York City, from skyscraper HVAC to waste removal to traffic light control. Here are my favorites so far (there are a total of four videos in the series; I didn't find the piece on the Verrazano-Narrows Bridge to be all that interesting from a systems point of view).
