Quba Mosque is the first mosque built in Islam, founded by Prophet Muhammad in 622 AD upon his arrival in Medina during the Hijrah. The mosque features 56 miniature domes, 7 main doors, 12 side entrances, and four parallel minarets. It accommodates over 20,000 worshippers and includes vast courtyards of white, red, and black marble. Praying here holds special spiritual merit according to hadith, with a prayer equal to the reward of an Umrah.