The Sultan Qaboos Grand Mosque is the third largest in the world, built between 1995 and 2001 from 300,000 tons of Indian sandstone. The complex is 1000m long and 885m wide. The most visible part of a mosque is the minaret, the tower from which the call to prayer is broadcast five times a day. There are four 45.5m minarets on the corners and a big central one of 91.5m, the five minarets symbolizing the five pillars of Islam.