A visit to Iceland, where two-thirds of babies are born to unmarried parents, to explore whether the nation will be the first country to completely let go of marriage.

Season 2 begins with a visit to Cuba where people are preparing for a tourist invasion.

An examination of the Colorado River that sustains more than 40 million people in the West to see whether enough efforts are being made to see that it continues to flow, with populations booming and the waters receding.

The magical kingdom of Bhuton, "the happiest place on earth," is visited to see whether it can stay blissfully content as the modern world encroaches its borders.

Weir goes on safari in Africa with naturalists fighting to save precious species from extinction.

Bill Weir travels to Amsterdam, famed as one of the world's liberal cities, to find out if it can stay that way amid a rising tide of intolerance.