Why do many mosques have elaborate domes?

The first and most important mosque of Muslims in Madina, the second holiest place in Islam after Makkah, did not have a tomb for more than 650 years after the Prophet, peace be upon him, passed away. read more

If your talking about mosques in the Middle East or South Asia then YES, domes and arches are the norm. But since i live in Indonesia, thousands of Miles east from those regions, mosque here have a more versatile shape and design. read more

Many mosques have elaborate domes, minarets, and prayer halls, in varying styles of architecture. Mosques originated on the Arabian Peninsula, but are now found in all inhabited continents. The mosque serves as a place where Muslims can come together for Ṣalāh (Arabic: صَـلَاة ‎, meaning "prayer") as well as a center for information, education, social welfare, and dispute settlement. read more