Travertine
Travertine is the pale limestone quarried near Tivoli that built the Colosseum's outer ring and the facade of St Peter's. Its pitted surface and warm colour are the look of ancient and Baroque Rome alike.
Example
The holes across the Colosseum's travertine are not damage from age but the sockets of iron clamps removed in the Middle Ages for their metal.
Sources: cultura.gov.it
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