I think you mean domes (qubaab in Arabic). You find them in a lot of Middle East architecture. Minarets (maazin in Arabic) are the towers attached to mosques which were classically used to call the azaan--the Muslim call to prayer. They largely have no function now as all but the most anachronistic muezzins call the prayer using a microphone and loudspeakers. I suppose the minarets are a good place to hang the loudspeakers.