A tourist boat travels near Kho Panyee village, Phang Nga Province, Thailand, May 19, 2018. REUTERS/Soe Zeya Tun

A view of Gediminas street in Vilnius, Lithuania May 19, 2018.

A couple from Serbia poses for a selfie in front of the Rhine Falls, the largest falls in Europe, during sunny spring weather in the town of Neuhausen, near Schaffhausen, Switzerland May 8, 2018.

Tourists pass their time as they visit Maya bay at Krabi province, Thailand May 23, 2018.

People walk at Gediminas street in Vilnius, Lithuania May 19, 2018. REUTERS/Ints Kalnins

A woman parasails above the water near the Zim Europa container ship crossing the Gulf of Suez towards the Red Sea before entering the Suez Canal, in El Ain El Sokhna in Suez, east of Cairo, Egypt, March 17, 2018.

Tourists pass their time as they visit Maya bay at Krabi province, Thailand May 23, 2018.

A tourist vessel sails past the Rhine Falls, the largest falls in Europe, during sunny spring weather in the town of Neuhausen, near Schaffhausen, Switzerland May 8, 2018.

People refresh themselves at a fountain in Vilnius, Lithuania May 19, 2018.

The sun is seen through the giant Ferris wheel on its way to the middle of the Arc de Triomphe at sunset during a phenomenon happening twice a year in Paris, France, May 8, 2018.

Photo used for illustration only. Container ships sail across the Gulf of Suez towards the Red Sea before entering the Suez Canal, in El Ain El Sokhna in Suez, east of Cairo, Egypt, March 17, 2018.