There are more than 10,000 cities around the world, half of which didn’t exist 40 years ago… And 55% of the world’s population — over 4 billion of us — call these cities home, with another million moving in every week. And all of these cities are, in some form or another, measured. Population, cost of living, crime rate, area size, death and birth rate, temperature, GDP… These are the types of numbers that define our cities. Because cities are nothing, if not a collection of numbers. By themselves though, they are just that. Numbers. Your basic statistics. But look behind a number and you’ll find a fascinating story. And that story will lead you to another number. And that number reveals another story and that story connects to another number…. …and before you know it you’ve got the sum of a city; its people and its origins, its singular culture, its defining politics, its economical strengths and weaknesses… The Sum of All Cities extrapolates, investigates and connects the numbers that make up our cities. This new documentary series is a fascinating and fast-paced tour around the world.