The Sultan Qaboos Grand Mosque in Muscat is a must-see architectural marvel, showcasing stunning Islamic art and design. Visitors should dress modestly, covering arms and legs, and women must cover their heads. The mosque is generally accessible to people with mobility issues. Exploring the mosque independently is common, allowing you to appreciate its details at your own pace, though guided tours can provide deeper insights. Note that it's closed to non-worshippers on Fridays and during prayer times. The visit is free, though donations are welcome, and typically lasts around 2-3 hours. The best time to visit is in the morning to avoid the midday heat, and be aware of potential crowds, especially on weekends.