Agnano

Lake Agnano formed in the Middle Ages in the volcanic crater but was drained in 1870 to increase arable land and reduce the habitat of the Anopheles mosquito, which carries the malaria parasite.

The Grotto of the Dog near the baths is an ancient cave which fills with volcanic carbon dioxide and has killed animals that entered it.

From here the water reached the individual rooms by means of a system of tubs, pipes and taps, the main conduit of which ran under the floor of the frigidarium.

The calidarium is rectangular in shape with one of the short sides having an apse and is heated by a praefurnium or furnace so as to reach a higher temperature.

[4][5][6] A group of statues of muses, including the famous Frankfurt Urania, was discovered in the Roman baths and is now in the Liebieghaus museum.

Four sculptures were also found in the frigidarium during the first excavations before 1911: Venus marina, armed Aphrodite, Hermes with child Dionysus, and Ganymede, now in the Naples museum datable to the first half of the 2nd century AD.