The document provides historical background on Roman architecture from 753 BC to 476 AD. It discusses the location of Rome and the extent of the Roman Empire. Key architectural features are summarized, including temples, basilicas, aqueducts, thermae, amphitheaters, and the Pantheon. The Pantheon had an entrance portico and circular interior structure capped by a magnificent dome. Engineering innovations like arches, vaults, and concrete allowed Romans to construct monumental structures that remained unsurpassed for centuries.