This film provides a comprehensive view of the large numbers of nuclear weapons that remain in the United States and Russia a decade after the end of the Cold War. The film shows the American and Russian “m ...

There is a controversial theory that for millions of years the Earth was entirely smothered in ice, up to one kilometre thick. The temperature hovers around -40ºC everywhere, even in the tropics and the equa ...

What keeps this gambling city aglitter? The Las Vegas power grid is a network of six power plants fuelled by nearly every source of energy: hydro-electric, coal and natural gas. From Harley-riding linemen to the no-no ...

To Mother Nature, Mexico City is one big target. On one side: one of the world's most earthquake-prone hotspots. On the other: one of the world's most active volcanoes. And beneath their feet - a shaky foundation of l ...

More than 10 million people live in Sao Paulo and every day, they generate 14,000 tons of garbage. But Sao Paulo is undergoing a green revolution. Follow one aluminum can from the time it is picked up by one of the ca ...

Public transportation is Mumbai's lifeline. The trains were built for 1700 passengers, but in this mega city, they carry three times that number. And the crowding will only get worse. Look at Mumbai's large scale lunc ...

Constructed in the nineteenth century, the sewers of Paris extend 2300 kilometres - the distance from Paris to Istanbul. Follow Phillipe Bussignies and his team as they lay out thousands of miles of fibre-optic cables ...

Hong Kong is one of the most densely populated urban regions on the planet. In the recent past it has been rocked by economic and financial upheaval. It now has the most high-tech, counterfeit-proof currency in the wo ...

In a city where 75 percent of the people don't have a car, the New York subway offers the best transit system in America. Follow the emergency management response team as they plot rescues, escapes and re-routing on t ...

How do the world's major cities keep functioning? While planes usually require a two-minute gap between departures, at Heathrow, the world's busiest airspace, this margin has been reduced to 45 seconds. Watch how air ...