Sultan Qaboos Grand Mosque by Omar Chatriwala on Flickr. The main dome of the Grand Mosque. At night the dome is illuminated in gold lights. The mosque is reportedly built from 300,000 tonnes of Indian sandstone.
Dating back to the second century BC, the Nabataean archaeological site, also known as Madain Saleh, has long been hidden from foreign visitors in this ultra-conservative kingdom that rarely opens up to tourists.
Telyashayakh Mosque (build pretty recently, just several year ago). On the right is Library museum that houses century Osman Quran, oldest in the world (Tamerlane's loot). Photos inside were not allowed.