Final answer:
Nero's palace, after the fire of Rome in 64 CE, was called the Domus Aurea or Golden House, a grand villa that revolutionized Roman architecture with extensive use of concrete for aesthetic purposes. The land was later used for public buildings like the Colosseum under Emperor Vespasian.
Step-by-step explanation:
Nero began building his palace called the Golden House, or Domus Aurea, after the great fire that swept through Rome in 64 CE. This vast new villa featured an architectural revolution with extensive use of concrete, including barrel vaults and domes, experiments that went beyond structural purposes and ventured into aesthetic domains. The Domus Aurea's construction used the cleared real estate from the fire, which was not in the public interest; however, it spurred on architectural advancements in Rome. After Nero's time, Vespasian transformed parts of the land from the Domus Aurea into public buildings like the Flavian Amphitheatre, initially named after the Flavian dynasty but later known as the Colosseum because it stood by a colossal statue of Nero as the sun god.