The Stabian Baths were in Pompeii before the Romans. Parts of the baths probably dated back to the 5th century B.C. In the bathing complex, there was a palaestra for exercise surrounded by a colonnade on three sides, and Greek-style hip baths (Beard, p. 244). The Stabian Baths continued to be modified up until the eruption of Vesuvius in A.D. 79, and were probably publicly owned.
The Stabian baths contain the earliest example of the hypocaust heating system that Romans used to heat their rooms. Their main entrance was from the Via dell'Abbondanza.
For details on the Stabian baths, see Chapter XXVII of Mau and Kelsey's Pompeii.
For 21st century information on Pompeii, see The Fires of Vesuvius, by Mary Beard.
