Mexico City is sinking. The sewers are overflowing, the landfills are closing, and mountains of Trash from iconic celebrations like the Day of the Dead have nowhere to go. But the city is fighting back.

Pilgrims have been visiting and dumping trash in the Holy City for thousands of years.

Whether Super Hi-Tech or Japanese Traditional, Tokyo's 33 million people always find a way to turn their Trash into something useful.

Angelenos dumped their Trash into the river, the studios trashed film stock and movie sets in the desert - and no one dreamt what horrors the future might bring.

Mumbai, financial center of India, fabled city of empires and fortunes. On a trash heap called Dharavi, over one million people earn pennies a day recycling the city's garbage.

At the end of World War 2 (WWII) Berlin looked like a pile of rubble and decades later the city still battles with trash from its tumultuous past.

Moscow churns out five million tons of garbage a year. Some blame Western-style consumerism, but things weren't much better back in the old days, when Peter the Great created the Moscow garbage man.

Since its founding in 1642, Montreal has been partying hard and creating lots of trash. After hosting the World Fair in 1967, Montreal tried to clean up its act, but discovered that changing its culture's mindset was nearly impossible.