Season 4 begins by examining the impact of water and rail on the economy of Chicago. Also: a look at the gourmet delights of the city, as well as its architectural wonders.

Exploring the Moroccan city of Tangier's culture and diversity.

The culture and economy of Amsterdam are explored during a tour of the city, which also examines life on the water.

Dublin's past and future are explored.

The history, culture and traditions of Oslo are explored.

An overview of Shanghai, one of China's most populated cities, is also known as a leading port and major center for industry, commerce and finance.

Exploring the history of the city of Cartagena in Columbia and the changes it is going through.

A look at the culture and society of Seoul.

Mumbai, the financial and commercial capital of India, is explored.

Shanghai's transformation over the years is highlighted.

A look at what Auckland, New Zealand, has to offer.

The varied landscape throughout Los Angeles is explored.

A guide to the metropolis of Rio de Janeiro, with its white-sand beaches, lush rain forests and green mountains.