Al-Masjid An-Nabawi, or the Prophet's Mosque, is located in Medina, Saudi Arabia. It is one of the holiest sites in Islam and was originally built by the Prophet Muhammad in 622 CE. The mosque has undergone several expansions over the centuries and can now accommodate over a million worshippers. The mosque is known for its stunning architecture, including the iconic green dome that marks the burial site of Muhammad. It features beautiful minarets, intricate mosaics, and spacious courtyards, making it a significant place for prayer and reflection for Muslims around the world.