Al-Masjid an-Nabawi, located in Medina, Saudi Arabia, is one of the holiest mosques in Islam. It was originally built by the Prophet Muhammad in 622 CE and has undergone several expansions over the centuries. The mosque is known for its beautiful architecture, including the iconic green dome that marks the burial site of the Prophet. The mosque serves as a major pilgrimage site for Muslims, especially during the Hajj and Umrah seasons. It can accommodate over a million worshippers and features numerous facilities, including prayer areas, libraries, and courtyards, making it a central hub for religious activities and community gatherings.