Masjid Sultan Qaaboos, Oman

Its position next to a motorway in Muscat might not be conducive to calm, but once guests are inside the Sultan Qaaboos mosque's gardens, thoughts of the tarmac pummelled by white 4x4s outside will be gone.

With peaceful sahn (courtyards), elegant riwaqs (arcades) and mesmerising murqanas (vaulted panelling), this place of worship is one of the most impressive buildings in this Gulf country. Its central minaret is 91.5 m (300 ft) tall, and the main prayer hall has a Persian carpet that took 600 women four years to weave.