travel

Passengers walk at a square of Zhengzhou East Railway Station in Zhengzhou...Passengers walk at a square of Zhengzhou East Railway Station in Zhengzhou, Henan province, February 17, 2014. REUTERS/Jason Lee

Jason Lee/Reuters

Passengers walk at a square of Zhengzhou East Railway Station in Zhengzhou, Henan province, China Read more

Afghans travel on a bus, on the outskirts of Kabul, Afghanistan, Tuesday, Aug. 27, 2013.

Ahmad Jamshid/AP

Afghans travel on a bus, on the outskirts of Kabul, Afghanistan, on Tuesday

Barack Obama, Air Force One...Air Force personnel stand at attention as Air Force One, with President Barack Obama aboard, prepares to taxi down the runway at Andrews Air Force Base, Md., Tuesday, Aug. 6, 2013. Obama is traveling to Arizona and California. (AP Photo/Susan Walsh)

Susan Walsh/AP

Air Force personnel stand to attention as an Air Force One, with US President Barack Obama on board, prepares to taxi down the runway at Andrews Air Force Base, Maryland on Tuesday. Mr Obama is travelling to Arizona and California. Read more

A man rides a bicycle as he carries his dog on his shoulders in Mumbai...A man rides a bicycle as he carries his dog on his shoulders in Mumbai July 9, 2013. REUTERS/Danish Siddiqui (INDIA - Tags: SOCIETY ANIMALS)

Danish Siddiqui/Reuters

A dog holds on tightly as his owner rides a bicycle in Mumbai, India, on Tuesday Read more

A child looks out from a train window be...A child looks out from a train window before leaving the Hefei railway station in Hefei, north China's Anhui province on July 1, 2013. China's summer travel peak starts on July 1, as railway systems serve an increasing number of passengers including students and tourists.

AFP

A child looks out from a train window before leaving Hefei railway station in Anhui, a province in north China. The peak summer travel period starts on Monday, with railway systems serving an increasing number of passengers including students and tourists Read more

An Afghan family travels in the trunk of a car on the outskirts of Kabul, Afghanistan, Thursday, June, 13, 2013.

Ahmad Jamshid/AP

An Afghan family travels in the boot of a car on the outskirts of Kabul, Afghanistan on Thursday