The Sultan Qaboos Grand Mosque in Oman is a stunning architectural wonder that's worth a visit. Built in 2001, it boasts intricate design details like a massive prayer carpet with 1.7 billion knots and a towering chandelier with 600,000 crystals. The main prayer hall can accommodate over 6,500 worshippers, while the overall capacity reaches up to 20,000. With its grandeur and beauty, this mosque is a must-see attraction in Muscat for both tourists and worshippers alike.