city

A general view shows the Gangnam area (t...A general view shows the Gangnam area (top) and Han river (C) within the city skyline of Seoul at dusk on February 4, 2014. With a population of some 25 million people, the metropolitan area of Seoul is one of the largest in the world.

Ed Jones/AFP

Seoul at dusk on Tuesday, with the Han river flowing through the centre. The metropolitan area of the capital of South Korea is one of the largest in the world, with a population of some 25m people. Read more

People throw tomatoes during Mission Deli Wraps's re-creation of the famous Spanish tomato-throwing festival, La Tomatina, at Canary Wharf, central London.

Geoff Caddick/PA

People throw tomatoes during a recreation of the famous Spanish tomato-throwing festival, La Tomatina, at Canary Wharf, London on Wednesday.

Burned cars are pictured in a highway in Ecatepec near Mexico city, on May 7, 2013. A gas tanker exploded in a Mexico City suburb on Tuesday, killing at least 18 people and damaging several homes and cars, an official said. AFP PHOTO/Victor RojasVICTOR ROJAS/AFP/Getty Images

Victor Rojas/Getty Images

Burning cars are pictured in a highway in Ecatepec near Mexico city, on Tuesday. A gas tanker exploded in a Mexico City suburb on Tuesday, killing at least 18 people and damaging several homes and cars