Are historic baths found outside Istanbul?
Yes. Bath heritage exists in other Turkish cities too. Each site's period, surviving remains and visitor access should be checked individually.

Related questions
Where does the Turkish hamam tradition come from?
It developed from earlier bathing traditions, including Roman baths, and took its own form in Ottoman society. Today's treatment packages are modern services, not an unchanged ancient ritual.
Why are some ancient baths connected to a gymnasium?
In some ancient complexes, bathing and physical exercise belonged to the same wider setting. A bath-gymnasium is not simply the ancient name for a modern spa.
How can I check whether a hamam's history is accurate?
Look for the building's own documented history, museum records and restoration research. Separate construction dates from later alterations and the current operator's marketing.