Some of the most famous names in opera and ballet have performed within this beautiful building since its inauguration in 2011, and the quality of the productions here (the season extends from September to May) regularly wins international acclaim. There's an efficient online reservation system with ticket collection on arrival. Note: there's a strict dress code for attending a performance.
Built by the same architects as the Grand Mosque, the Royal Opera House Muscat is worth a visit simply to admire the harmonious amalgam of marble, inlaid wood and arabesque design. In fact, even if you're not intending to catch a show, there's a sociable ambiance at the restaurants and coffee shops outside the opera house and window-shopping is fun in the opulent Opera Galleria arcade that forms part of the same complex.
Call the box office to check the availability of tours of the Opera House. If you decide to stay on for a performance (at which jeans and sports shoes are not permitted), you can hire suitable clothing on-site.