The Quba Mosque is located in Medina, Saudi Arabia and is considered the first mosque built in Islam. It was established in 622 CE by the Prophet Muhammad upon his arrival in Medina after the Hijra. The mosque holds great historical significance and is a popular pilgrimage site for Muslims. The mosque features a simple yet elegant design, with a large prayer hall and a beautiful courtyard. It is known for its whitewashed walls and distinctive minarets. The Quba Mosque is also recognized for its spiritual importance, as it is believed that praying here carries great rewards.