← Back to the map
Baiae
Italia · Roman province·Italy·Founded 2nd c. BCE (resort)
The emperors' favorite spa. Domed bath halls fed by volcanic hot springs on the Bay of Naples. Trajan and his court would have known it well.
Largely submerged; much of the ancient resort now lies underwater in the Bay of Naples, protected as the Baia Underwater Archaeological Park and visited by divers.
Open Baiae on the interactive map →Roman Maps shows the empire frozen at 11 August 117 CE, the day Trajan died — its moment of greatest territorial extent. Explore the full map →