Several things: First - This is spectacular! The detail and use of perspective is amazing. As an imagined combination of interior and exterior it works, and beautifully.
Secondly, although the notions are different, this could be one of Escher's finer uses of space, without his often surreal aspects.
It's that good.
Lastly, as an historian, this looks like a combination of a Venetian exterior with a Muslim-Byzantine interior; Byzantine in its complex nature, and Muslim in its total avoidance of any live elements (No possibility of an idol).
An easy Fave!