Ancient Roman architecture is characterized by its use of concrete, arches, vaults, and domes, allowing for grand structures and large public spaces. Notable features include the development of concrete to create durable buildings, the arch that enabled longer spans and heavier loads, and the dome exemplified by the Pantheon. The Romans also innovated with aqueducts for water transport and built extensive road networks. Their designs often emphasized grandeur and accessibility, evident in the construction of monumental buildings like amphitheaters, temples, and basilicas, many of which influenced architectural styles for centuries to come.