How Cities Work

Documentary exploring the technological infrastructure that keeps the world's cities alive with activity, from the electricity that powers computers to the clean water flowing from showers and the vast supplies of food in shops. Includes an insight into the work of people who perform the unsung tasks to maintain these metropolitan centres, and the engineers responsible for making ingenious plans to ensure cities can cater for rocketing populations.

The documentary highlighting the work of those responsible for keeping the world's cities alive with activity continues, this time looking at how food is replenished.

A look at how architects and builders deal with the constant challenge of how to create new spaces in cities where every plot has already been developed.

An insight into how transport links - a city's veins and arteries - are created and maintained, which is an endless task demanding brain and brawn.

A look at how cities across the world provide water to billions of people - a challenge that becomes more and more complex with every passing year.