
1) Coastal town in Campania 2) National museum of Italy 3) World Heritage Site in Italy
Found on
https://www.crosswordclues.com/clue/oplontis

Oplontis was a town near Pompeii, in the Roman Empire. On August 24, AD 79, the eruption of Mount Vesuvius buried it under a deep layer of ash. It is today the location of the Villa Poppaea, the villa possibly associated with the second wife of Emperor Nero, was excavated in the mid-20th century, wrapping up in 1984, and is currently open to the p...
Found on
http://en.wikipedia.org/wiki/Oplontis
No exact match found.