I visited the Turkish Baths in Plaka today. I found out about them in Lonely Planet. I don’t think many tourists visit them because when I walked in around 8:30 the man at the desk looked surprised to see a visitor and had to turn on the lights in the place. The baths are really well restored 17th-century public bathhouse and a remnant of the Ottoman times. The only criticism I have is that more signage as to what you are looking at would have been really nice. They had pictures projected onto some of the walls that did help a little.
Changing area
Changing area
Changing area
Ceiling of changing area
Door to the bathing areas
Bathing area ceiling, the lights are from glass domes through the roof catching sunlight
Basin
Bathing area
Bathing area
Bathing area