The empire known for its contribution to Roman architecture is the Roman Empire itself. Renowned for its innovative engineering and architectural techniques, the Romans utilized concrete, arches, and aqueducts, revolutionizing construction practices. Iconic structures such as the Colosseum, the Pantheon, and numerous aqueducts exemplify their architectural prowess. The use of the arch allowed for larger and more durable structures, with many built-to-last infrastructure that showcased the empire's grandeur and organizational capabilities. This architectural legacy is still influential today and is often studied in the context of ancient engineering and design principles.