1- The design/engineering of the Coliseum was an amazing thing. Oftentimes, we would not see the intricacies of how it worked based upon simple images. The archeological remains have been studied at length and reveal even more structural/functional elements developed to fill the needs of this amazing venue including underground rooms & plumbing and sunshades for events in a hot and very sunny climate – here are some good links to check out. What sort of productions were important enough to this culture that they would go to such lengths to perfect a structure like this? What were the cultural concerns that lead to this innovation? Can you see any of the innovations present in this ancient architecture used in arenas today?
http://www.roman-colosseum.info/roman-colosseum-sitemap.htm
http://www.roman-colosseum.info/colosseum/beneath-the-colosseum.htm
http://www.roman-colosseum.info/colosseum/awning-at-the-colosseum.htm