This is one of Muscat’s most famous landmarks. Islamic architecture at its best, this edifice is magnificent from the outside and even more spectacular from the inside. The mosque took nearly ten years to construct and is one of the largest mosques in the world. Inside, the mosque boasts the world’s second largest single-piece carpet and the world’s second largest chandelier, which help make the interior as breath-taking as the building's exterior. Tourists planning to enter the mosque should keep in mind that entering in short-sleeved shirts, dresses and in skirts is prohibited. Female tourists must also keep their heads covered inside the premises.