The Romans were the first people in antiquity to do what with their architecture?

Question

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The Romans were the first to use concrete on a massive scale in their architecture, which allowed them to create massive structures such as the Colosseum and aqueducts. While they did create colonnades and rectangular structures, this was not unique to their architecture and had been used by other cultures before them. They also did not necessarily imitate the Greek style of building, as they developed their own unique style. While they did create interconnected roads, this was not a part of their architecture.

The Romans Were the First People in Antiquity to Do