Roman architecture spanned from 753 BCE to 337 CE, progressing through several periods. Some notable examples include the Temple of Vesta from the Roman Republic in the 1st century BCE, the Ara Pacis altar from 13-9 BCE during the early empire, and the Pantheon's iconic dome structure built under Hadrian in 117-125 CE. Roman architectural styles evolved over this thousand-year time frame, seen in structures like temples, forums, baths, arches and more that incorporated innovative building techniques like vaults and domes.