Masjid al-Haram was built around the Kaaba. It is also the largest mosque in the world. It was first built under the leadership of the Caliph Omar Ibn al-Khattab (634-644) and has been modified continuously under several Muslim rulers. Omar, the first Caliph, ordered the demolition of some houses surrounding the Kaaba in order to accommodate the growing number of pilgrims and built a 1.5 meter high wall to delineate a large prayer area. During the reign of his successor Caliph Uthman Ibn ... Masjid al Haram also known as the Great Mosque of Mecca, is considered to be the most significant mosque in Islam. Book your Umrah Taxi Now! What is the significance of Masjid al-Haram? Masjid al-Haram is the holiest mosque in Islam, home to the Ka’ba and a destination for millions of pilgrims. Al Masjed Al Haram The Heart of Makkah and the Spiritual Center of Islam Hey! Log In or Sign Up to save your favorite attractions Log In or Sign Up