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| | ArtLex on Roman art |
 | | The design of this structure was made possibly because of the Romans' invention of concrete, used primarily for the foundations. |
 | | Travertine was used to face the exterior, for the piers and arcades, tufa infill between piers for the walls of the lower two levels, brick-faced concrete for the upper levels and for most of the vaults, limestone largely for floors, and marble for seats, columns, and ornament. |
 | | Even in its current ruined state, the Colosseum recalls the gladiatorial contests, the naval displays, and the martyrdom of Christians which took place within its walls before it became a medieval fortress or was plundered to provide building materials for |
| www.artlex.com /ArtLex/r/roman.html (1046 words) |
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