Gemini

I have never, ever, seen anything like this before. It is two entire churches beneath a single shared roof and without a dividing wall between the two. I suppose the nearest equivalent would be those churches on especially hallowed ground around Jerusalem or Bethlehem where a single church is shared by several different sects but all worshipping the same principle.
This, on the other hand, is like conjoined twin churches, on one side we have Kostas & Eleni and on the other we have Panteleimon. 

Extra 1 - All the Greek churches I have seen have the open doorway into the vestry at the left and the screened doorway in the centre. The same happens here, but it does so twice - so symmetry was obviously not an option. I wonder why that is.

Extra 2 - This mural depicts the holy trinity in the hospitality of Abraham (and Sarah of course, who is not mentioned). Curious to see the holy geezers looking quite so girly wouldn't you say?