The Nevsky Cathedral in Yalta
I can't quite read what the mosaic book says; archaic Cyrillic letter-forms are not my thing, though I know I have readers who can read it. The bottom right word is presumably Миру.
(it looks slightly fuzzy because I superimposed three pictures to try to get the domes and the mosaic simultaneously correctly exposed)
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(I'm afraid that pretty much exhausts my Russian, I studied only for a couple of years when I was 14-16)
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