Final answer:
Concrete arches replaced marble in Roman architecture, with the Pantheon being a notable example of this structural transformation.
Explanation:
Concrete arches replaced marble in Roman architecture, particularly in structures like the Pantheon. Concrete allowed Romans to create innovative interior spaces and architectural forms, such as the impressive domed ceilings.
The Pantheon, built in 126 CE, showcases the use of granite columns at the entrance, combining with poured concrete to create its unique structure lasting over 2000 years.
Roman engineering techniques, like arches and vaulting incorporated into walls, made the Pantheon a remarkable example of Roman architectural advancements.
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