Once upon a time the ancient city of Baiae (Baia) was the hedonistic escape for the elite members of the ancient Roman empire.

Built on the edge of the supervolcano Campi Flegrei (Phlegraean Fields), the resort town of Baiae was created to take advantage of the thermal hot springs on one side and the incredible Gulf of Pozzuoli on the other.

Anyone who was anyone had a villa in Baiae… Julius Caesar, Nero, Hadrian and Caligula to name a few. Though the more moralistic of Roman society stayed away, fearing the excesses of the town would corrupt them. This was a place that from all accounts could put Las Vegas to shame.

The poet Sextus Propertius, who was not known for being particularly pious, wrote  in 25BC:

“But you must quickly leave degenerate Baiae;
these beaches bring divorce to many,
beaches for long the enemy of decent girls.
A curse on Baiae’s water, love’s disgrace!”

At its height, Baiae truly was the place to be, but like much of history, over time as the Roman Empire declined, so to did the popularity of Baiae.

The opulent villas, built on pylons directly over the Bay, slowly sank due to the volcanic activity of the nearby Phlegraen Fields. Muslim raiders in the 8th Century AD devasted the area before malaria dealt the final blow to the population of Baiae in 1500.

Known as ‘bradyseism’, the slow rising and sinking of land in the area has reshaped much of the landscape, causing around 100 metres (328 feet) of the original town to sink below the sea.  

Archaeological site in Baiae near Naples

The underwater Archaeological Park of Baiae 

is unusual in that it is completely exposed underwater. There is no way for the locals to protect the ruins from poaching or from the natural erosion caused by tides. However, in 2002 the 177-hectare site was declared a Marine Protected Area. Potentially a little too late.  Over the years fisherman were known to accidentally collect ancient sculptures into their fishing nets instead of fish… often selling their finds to black markets.

You will be able to find artefacts from the underwater site in the nearby Archaeological Museum of Campi Flegrei. From mosaics to sculptures it is a fascinating look into the Ancient Roman civilization.

Today there are researchers, engineers and archaeologists working to find and preserve as much of the underwater city as possible, before nature fully takes over. However the constantly shifting sands mean new things are found as often as previously recorded ones are lost (at least until the sands move again).

Statue underwater in Baiae, Naples
Image by: Ruthven, CC0, via Wikimedia Commons

How to visit Baiae

To visit the archaeological park of Terme di Baia, take a train or drive to Bacoli. For €4 euros you can visit the 4 sites within the park.

  • The archaeological park which includes the ruins and baths down to the harbour
  • The Aragonese Castle which overlooks the habour, along with the museum of Campi Flegri which sits inside
  • The archeological site of Cuma (home of the Ancient Greek Sybil – female prophets/oracles)
  • The Flavian Amphitheatre of Pozzuli

Of course, for a truly unique experience you can also explore the underwater city as well:

By glass-bottomed boat

If you are limited in time, or simply prefer not to swim, Baia Sommersa run glass-bottomed boat tours of the submerged bay. Running every Friday, Saturday and Sunday (weather permitting), the tour goes for about 1 hour and costs €12.

Snorkelling & Scuba Diving

Want to get into the water and see this unique site up close?

The Campi Flegri Diving Centre offers guided scuba-diving and snorkelling excursions to the Bay of Baia. The price varies depending on whether you are snorkelling (starting at €25) to scuba-diving (starting at €35). All equipment needed is available to rent and the dives run for about 2.5 hours.

Entrance to the Cave of the Sibyl, Cumae, Italy
Entrance to the Cave of the Sibyl, Cumae, Italy. Image by: AlexanderVanLoon, CC BY-SA 3.0 , via Wikimedia Commons
This post may contain affiliate links. Please see my full disclosure policy for details.

Explore Baiae with these Activities

Pin me for reference!

Discover the ancient roman city of Baiae

Write A Comment

Pin It