The Roman architectural innovations included barrel vaults, concrete and windows that let in light.
- The Roman Empire despite being known for its empire and conquest that was also famous for building structures.
- The discovery and use of concrete allowed the Romans to carry out a vast program of public works.
- Concrete helped in building roads, harbour facilities, bridges, aqueducts and fortifications built.
- Barrel vaults are part of the design in a building that has a tunnel in the shape of an arch where it can support the structure standing on it.
- Roman also built windows that let in light.
- Before the coming of the glass window, they built small rectangular windows that allowed for the wind to enter and exit the structure.
Therefore we can conclude that the Roman architectural innovations play a significant role in building structures.
Thus barrel vaults, concrete and windows that let in light is the correct answer.
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