This is one major reason why all you see in Iran is mainly Iranian architecture. The similarity of this church to the mosques, the shape of the dome, the decoration, etc all tell you that some artists and architects have built them according to the trends and interests prevailing in Iran during centuries.
The cross on top of the dome is one major sign it's a church, not a mosque. Of course, there are Armenian inscriptions on the facade too.
The mural painting inside are a change for those who have seen lots of mosques during their visits in Iran.
The museum highlights the sufferings Armenians have gone through in 20th century. The items are indicating Armenian life among other topics. I recommend to visit it as well.
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