Is Zeyrek worth visiting for hamam architecture?
Zeyrek Çinili Hamam offers a specific architectural and museum context. Check its current visitor arrangements; it is a separate venue from Golden Royal.

Related questions
Does a Zeyrek bath booking include its museum?
Do not assume it does. Check the operator's current ticket and treatment terms; museum access and bathing can be separate arrangements.
Are there Byzantine remains beneath Istanbul hamams?
At Zeyrek Çinili Hamam, Byzantine cisterns survive beneath the Ottoman bath. That is this building's story; it does not describe every hamam in Istanbul.
Why does restoration sometimes uncover older remains?
Work can reveal earlier layers concealed beneath or behind later structures. Archaeological findings need documented interpretation, rather than assumptions based on appearance.