The largest area of Roman innovation in architecture was what?

Name: The largest area of Roman innovation in architecture was what?
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The use of concrete on a massive scale was the largest area of Roman innovation in architecture. This allowed for the construction of larger, more complex buildings and structures, such as the Colosseum and aqueducts. Stained glass and colonnades were not unique to Roman architecture.

The Largest Area of Roman Innovation in Architecture Was What