 The FAO Building, originally built under the Fascist government of Italy, overlooks the "thermae" that were in operation until when?
FAO Building, Rome: The FAO Building (Italian: "Palazzo FAO" , literally "FAO Palace") is the international headquarters of the Food and Agriculture Organization (FAO), located in the San Saba rione of Rome, Italy. FAO Building, Rome:  The building is located the in one of the most scenic parts of Rome, southeast of the Aventine Hill, and overlooking the Baths of Caracalla and the Circus Maximus. Baths of Caracalla: The Baths of Caracalla (Italian: "Terme di Caracalla" ) in Rome, Italy, were the city's second largest Roman public baths, or "thermae", likely built between AD 212 (or 211) and 216/217, during the reigns of emperors Septimius Severus and Caracalla. Baths of Caracalla:  They were in operation until the 530s and then fell into disuse and ruin.
530s