Mega cities rule our world, magnetically attracting recognition as well as challenges. Follow the countdown to the largest, and see who has reached their objectives and who is struggling.
#10 - New York City #9 - Beijing #8 - Cairo/ Mexico City #7 - Sau Paulo #6 - Mumbai #5 - Dhaka #4 - Seoul #3 - Delhi/ Guangzhou-Foshan/Jakarta/Manila #2 - Shanghai #1 - Tokyo
