Simon goes on a perilous covert journey into Burma, where western journalists are banned.
Woolwich ferryman Colin Window travels to Dhaka, Bangladesh to train as a sampan operator.
Andrew finds out how megacities stay fed, and joins Mexico City's traffic cops in the air.
Andrew Marr takes a look at safety and security, visiting Tokyo, London and Mexico City.
Andrew Marr looks at how people live in London, Dhaka, Tokyo, Mexico City and Shanghai.