Ancient Roman culture was heavily influenced by Ancient Greek culture, adopting many everyday customs, laws, architectural styles, and more from the Greeks. Rome was a massive city at its peak, with population estimates ranging from 450,000 to over 3.5 million. Daily life in Roman cities revolved around the central Forum district, where people would shop, trade, participate in events. Several iconic structures that still stand today were built during the Roman Empire, including the Colosseum, Pantheon, Domus Aurea residence of Nero, Trajan's Market, Trevi Fountain, Temple of Vesta, Temple of Saturn, Arch of Septimius Severus, Baths of Caracalla, Appian