Underground chamber found under palace of Emperor Nero
I have been there a few times. But the palace was filled with rock at dirt after Nero's death. And then the structures we see today were built on top of it. I guess the local mobs missed this underground chamber.
A mysterious underground chamber has been discovered under the palace of Roman Emperor Nero, a secret that had been kept for almost 2,000 years.
The chamber, which was found by archaeologists who were working on restorations of the Domus Aurea palace late last year, also contains walls that are adorned with real and mythical creatures, such as a "silent and solitary sphinx," according to a translated statement discussing the find.
"The discovery of this room is part of the scientific research strategy that the Park carries out every day together with the safety and restoration interventions," Alfonsina Russo, director of the Archaeological Park of the Colosseum, explained in the statement. "In the dark for almost 20 centuries, the Sala della Sfinge [Sphinx room] – as we have called it – tells us about the atmosphere of the years of the principality of Nero."