Its meant to be seen and to show importance
Its like a sentence, when someone emphasizes a word, it shows the importance of that word in the sentence, so if an artist darkens a certain part of a picture or makes it bold to emphasize it, then it means the emphasized part is important to the picture and the story.
nope becasue a mosque is a place where muslims pray to god, but the taj mahal was built by (forgive me) someone for his wife. i dont think anyone prays there. also a mosque is for muslims but indians are hindi.
can you rephrase the question? was there a picture to go along with it?