Nero's Golden Palace was a location hidden underneath Rome. It was underneath the Terme di Traiano and served as a Lair of Romulus. The Assassin Ezio Auditore da Firenze visited this Lair shortly after his arrival in Rome.
Nero's Golden Palace was a lavish palace built by the Roman Emperor Nero after the Great Fire of Rome in 64 CE. Some people claim that he intentionally started the fire to make room for his palace on Esquiline Hill. It is also likely that Nero used the aqueducts to build his palace because they did not give water to civilians anymore for a time.
However, after Nero committed suicide in 68 C.E., the Roman Emperors Vespasian, Titus, and Domitian built on top of Nero's Palace, effectively burying it. Finally, Emperor Trajan built his famous bath house on top of what was left of it, causing it to be forgotten about until the Renaissance. During this time, a pagan cult, the Followers of Romulus, took over the ruined palace and kept one of their Romulus scrolls here until it was discovered by Ezio Auditore in 1500.