Secrets of lost empires. Colosseum [videorecording] / produced by Cynthia Page, Julia Cort ; narration written by Julia Cort ; a NOVA production by the WGBH/Boston Science Unit and BBC-TV.
South Burlington, VT : WGBH Video, c1997.
1 videocassette (60 min.) : sd., col. ; 1/2 in.
Explores two competing concepts of how the ancient Romans were able to construct a canopy over the Colosseum.