What purpose does the mihrab have as an architectural element in mosques?

In addition to marking the qiblah, the mihrab traditionally helped to amplify the voice of the Imam during congregational prayer, although microphones now serve that purpose. The mihrab, also known as a prayer niche, is a common element of Islamic mosque architecture throughout the world. hope this helps

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.