South Asian countries in terms of total contribution of travel and tourism to GDP. #6. Vietnam, Total GDP: USD 202.6 billion (2016). Contribution of Travel and Tourism to GDP: 9.1% . Here: A boat in the Thu Bon River, Hoi An, Vietnam. (Photo by Domingo Leiva/Getty Images)

These Northern Lights “rainbows” have turned the sky greener than the Earth below. Vitaly Istomin, 26, spent several nights in freezing conditions under the stars in northern Russia’s Khibiny Mountains to capture the aurora’s “rainbows”. (Photo by Vitaly Istomin/Caters News Agency)

A dump truck carrying cleaning workers drives on Havana's malecon as a wave crashes on the sea wall, in Cuba, Tuesday, January 24, 2017. Due to high winds and tides, the sea pushed over the sea wall, flooding low parts of the Vedado neighborhood of Havana. (Photo by Desmond Boylan/AP Photo)

A Hindu holy man, or sadhu, smokes marijuana in a chillum at the premises of Pashupatinath Temple, ahead of the Shivaratri festival in Kathmandu, Nepal February 15, 2017. (Photo by Navesh Chitrakar/Reuters)

An exotic model poses for photographs at a news conference to promote the “Expo Sеx and Eroticism” adult exhibition in Mexico City, Mexico March 1, 2017. (Photo by Carlos Jasso/Reuters)

The dashboard of a 1980 Teal Type 35 Bugatti (estimate £28,000 - £35,000) on display inside the Royal Horticultural Halls on April 11, 2017 in London, England. Coys automobile auctioneers are putting almost 70 classic cars up for auction in their Spring Classics sale in Westminster tomorrow, April 12, 2017. (Photo by Jack Taylor/Getty Images)

Fishermen pull a net containing fish from a pond during the traditional carp haul near the village of Belcice, Czech Republic, October 25, 2016. Carp, the traditional Czech Christmas Eve dinner, is harvested primarly from the region of southern Bohemian lakes. (Photo by David W. Cerny/Reuters)

A lone protester sings outside the offices of Republican president-elect Donald Trump at Trump Tower in New York, New York, U.S. November 14, 2016. (Photo by Carlo Allegri/Reuters)