What were some important architectural and engineering achievement of the ancient Romans?

The ancient Romans were renowned for their impressive architectural and engineering achievements, most notably the development of the arch, which allowed for the construction of larger and more durable structures. They perfected the use of concrete, enabling the creation of iconic buildings like the Pantheon with its massive dome. Additionally, the Romans built extensive aqueduct systems to transport water over long distances, showcasing their advanced understanding of hydraulics. Their innovations in road construction facilitated trade and military movement across the vast Roman Empire.