Visit the Sultan Qaboos Grand Mosque, After having an architectural competition to select the best design for it, construction took six years. The mosque’s total capacity is 20,000 worshipers, and it covers an estimated area of 416,000 square metres. The mosque’s prayer hall floor is topped with a single piece Persian carpet composed of 1,700 million knots which took about 27 months to make, covering an area of 4,200 square metres, and weighing 21 tons. 28 different colours made from plant or natural dyes, in varying gradations, are used in this carpet’s weave.Non-Muslims are allowed to visit the mosque every day, except Friday, from 8:30 until 11:00 am.