Masjid al-Haram is the largest mosque in the world, surrounding the Kaaba, the holiest site in Islam. It welcomes millions of pilgrims annually for Hajj and Umrah. The mosque has undergone massive expansions throughout history, now covering over 1.5 million square meters. It houses the Kaaba, Maqam Ibrahim, Zamzam Well, and the Sa'i corridor between Safa and Marwa hills. The mosque operates 24/7 and features modern amenities including air conditioning, elevators, and water facilities. Recent expansions include smart technology, AI guidance robots, and enhanced accessibility features.