The Grand Mosque, also known as the Great Mosque of Mecca or Masjid al-Haram, is the largest mosque in the world, located in Mecca, Saudi Arabia. It surrounds the Kaaba, the most sacred site in Islam, where millions of Muslims gather annually for the Hajj pilgrimage. The mosque can accommodate over two million worshippers at once. The mosque has undergone several expansions since its original construction in the 7th century. It features stunning architecture, including marble floors, intricate mosaics, and towering minarets. The Grand Mosque serves as a central place of worship and a symbol of unity for Muslims worldwide.