http://www.arenes-nimes.com/en/bit-history
http://www.reidsitaly.com/destinations/lazio/rome/sights/colosseum.html
http://archeoroma.beniculturali.it/en/archaeological-site/colosseum
https://en.wikipedia.org/wiki/Colosseum
https://en.wikipedia.org/wiki/Gladiator
http://www.reidsitaly.com/destinations/lazio/rome/sights/colosseum.html
http://archeoroma.beniculturali.it/en/archaeological-site/colosseum
https://en.wikipedia.org/wiki/Colosseum
https://en.wikipedia.org/wiki/Gladiator