In 1992 Sultan Qaboos directed that his country of Oman should have a Grand Mosque. A competition for its design took place in 1993 and after a site was chosen at Bausher construction commenced in 1995. Building work

Sultan Qaboos Grand Mosque

, which was undertaken by Carillion  Alawi LLC took six years and four months. The Mosque  is built from 300,000 tonnes of Indian sandstone and eleventh largest mosque in the world. The main musalla (prayer hall) is square (external dimensions 74.4 x 74.4 metres) with a central dome rising to a height of fifty metres above the floor. The dome and the main minaret (90 metres) and four flanking minarets (45.5 metres) are the mosque’s chief visual features.

source : http://thewondrous.com