Skiers enjoy a sunny winter day in the mountain area of Hoch-Ybrig, Switzerland January 6, 2018.

A cruise boat sails past the reflection of Christ the Saviour Cathedral on the icy Moskva river in Moscow, Russia January 10, 2018.

Domestic and foreign tourists walk in front of Humayun's Tomb, one of the tourist destinations in New Delhi, India, January 1, 2018.

Snowcats are seen on a slope during a long-time exposure at the skiing area of Sankt Johann in Tyrol, Austria January 10, 2018.

A view of Lima is seen from the top of Morro Solar hill in Lima's district of Chorrillos, Peru, January 13, 2018.

Visitors climb the steps towards the islet of San Juan de Gaztelugatxe, featured in the American television series Game of Thrones, on the Basque coastline 35km (21 miles) from Bilbao, January 12, 2018.

People walk outside the Royal Palace in Madrid, Spain January 11, 2018.

A general view of Warsaw city is seen from the Palace of Culture and Science in Warsaw, Poland January 8, 2018.

A tree is seen in Val D'Orcia, Italy, January 5, 2018.

A view of the Palazzo Ducale in San Marco's Square in Venice, Italy January 6, 2018.

Image used for illustrative purpose. People are sitting at a restaurant in Dubai mall, United Arab Emirates January 12, 2018.

People are sitting at a restaurant in Dubai mall, United Arab Emirates January 12, 2018.

People use a boat as they tour the Global village in Dubai, United Arab Emirates December 24, 2017.

Men enjoy their time at Al Reem Reserve camp, west of Riyadh, Saudi Arabia, January 5, 2018. Image used for illustrative purpose.

Women ride quad bikes at Al Reem Reserve camp, west of Riyadh, Saudi Arabia, January 5, 2018.

A woman takes pictures as a man releases a falcon at Al Reem Reserve camp, west of Riyadh, Saudi Arabia, January 5, 2018. Reuters/Faisal Al Nasser

The ancient ruins of the Greek and Roman city in Shahhat, Libya January 5, 2018.

A general view of the ancient ruins of the Greek and Roman city in Shahhat, Libya January 5, 2018.

The InterContinental hotel is seen in the Swiss mountain resort of Davos, Switzerland, January 11, 2018.

Domestic tourists take selfies in front of the historic Red Fort, one of the tourist destinations in the old quarters of Delhi, India, January 3, 2018. Image used for illustrative purpose.

A view shows the Pont de l'Alma bridge with the Zouave statue as the Seine River rises after days of rainy weather in Paris, France January 5, 2018.

A view of the Grand Canal in Venice, Italy January 6, 2018.