Nero's Golden House is very cool inside. I remember trying to imagine what it would have been like in its glory days. There were stories about thieves coming in on ropes to take the riches inside, and other interesting things. It was also slightly creepy since it wasn't brightly lit and is underground mostly. Sadly, it's been closed since 2010 due to structural damage. I hope it opens back up, it's awesome.
Nero's Golden House where he used to stage lavish banquets and have elephants and other exotic animals parading through its corridors. Despite its proximity to the Colosseum, the now subterranean palace tends to be unfamiliar to all but those with a more expert knowledge of the city. Michaelangelo, Ghirlandaio and Raphael used to descend on ropes to take sketches of the beautiful frescoes by candlelight - Raphael was so inspired by what he saw that he used these as the basis for the decoration of the Loggia at the Vatican. Sadly a large section of the palace collapsed following heavy rainfall in 2010 and in true Italian style there has been chaotic bickering about the future of the restoration programme.
The Domus Aurea (Golden House) was a large landscaped portico villa. Designed to take advantage of artificially created landscapes, Domus Aurea was built by the Emperor, Nero, in the heart of ancient Rome, after the great fire in 64 AD had cleared away the aristocratic dwellings on the slopes of the Palatine Hill.