|NEW: The bowels of the , the underground tunnels where and wild beasts crouched before being winched up to the killing floor, are visible as never before thanks to a restoration funded by 's||Morley, Metropolis and Hinterland Cambridge, 1996 33—9• Wilford, John Nobel 12 June 2007|
|Jaffery, Owais 9 June 2011||2003—2009 City of Tunis Portal|
Parker, Philip, "The Empire Stops Here".28
|In 1992 after a the XIX Circoscrizione became the of• Bremner, Caroline 12 December 2008||2005 , The Seven Hills of Rome: A Geological Tour of the Eternal City|
|Claudio Rendina, Roma ieri, oggi, domani, Newton Compton, Roma, 2007, pg||The City of New York|
Dal aperti al pubblico per la prima volta gli ipogei del Colosseo.
|John Boardman; Jasper Griffin; Oswyn Murray 15 January 2001||2 April 1934 , pp101-116|
|Llewellyn, Rome in the Dark Ages London 1993 , p|