Image by Mark Broadhead Getty Images

Built by South Indian Muslims in 1935 on the site of an earlier mosque, lime-green Saigon Central Mosque is an immaculately clean and well-tended island of calm in the bustling Dong Khoi area. In front of the sparkling white and blue structure, with its four decorative minarets, is a pool for the ritual ablutions required by Islamic law before prayers.

Take off your shoes before entering the building.