Vietnamese photographer Tran Tuan Viet won Reader Choice's Award in this year's 18th annual Smithsonian photo contest, with with a shot from a colorful hot air balloon festival in Ba Vi, Hanoi.

The photo capturing a street fish tank hanging on a fishmonger's motor in Hanoi has surpassed tens of thousands of other competitors to win the prestigious American photography contest - 17th Smithsonian Magazine Photo Contest.