It is definitely worth visiting Istanbul. There is a courtyard nearby, where an old Turk came up to us and began to tell a story in English.
It seems that the temple was erected as a prototype of Hagia Sophia, to test architectural solutions, the main thing is the dome.
So this is a smaller copy, admission is free and there is no queue.
It's fun there when there's no way to go to the big Hagia Sophia, the little one was built earlier than Hagia Sophia. Across the entire mosque there is an inscription glory to Sergei.... And the Roman Army in Greek. There are many impressions. I recommend it, for free, until you walk through the beautiful streets.
A wonderful place without crowds of tourists, very beautiful. I imagined her much less than she is . a nice courtyard and lots of cats living inside. There is even a cafe