The Masjid Sultan Haji Hassanal Bolkiah or commonly known as The Grand Mosque in Cotabato City is currently the biggest mosque in the Philippines. The towering minarets are 43 meters, which is equivalent to a 15-story building, with a pilot's light on top to avoid aerial accidents. The walls are painted white, while the gigantic domes are covered with gold with crescent moons on top.