The Grand Mosque is the greatest mosque in Islam and is located in the heart of the city of Mecca in the west of the Kingdom of Saudi Arabia, and in the middle is the Kaaba, which is the first building to be laid on earth, and this is the greatest and holiest spot on earth for Muslims. The Grand Mosque is the qiblah of Muslims towards which they turn in their prayers wherever they are, and it is the first of the three mosques to which they travel. The most important thing that distinguishes it is that it is the largest mosque in the world, with a capacity of four million worshipers at the same time.