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

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.

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.

A report on an American conservationist who has purchased vast tracts of land in Patagonia, much to the dismay of local developers.

A visit to Madagascar where deforestation rages and unique species vanish, and where a fight is brewing to save one of the planet's most special places before it is ruined forever.

As sea levels rise, the sunken city of Heracleion sounds a stark warning of the growing threat faced by the planet's teeming coastal cities.

Miners want to drill for billions of dollars worth of copper and gold beneath the pristine wilderness of America's last wild frontier but fishermen say the world's last great salmon run could be jeopardized.

A look at predatory mammals in New Zealand.

A look at whether the fragile beauty of the Incan ruins of Machu Picchu can be protected from an ever-growing number of visitors.

The pristine land of President Lincoln's favorite state is under threat like never before as developers, conservationists and cowboys battle for territory.

Global warming is dramatically altering the landscape — and the prospects — of the world's largest island.

As surging seas and frequent floods batter America's most historic city, the fight is on to save beautiful Charleston and its storied past.

The global shutdown gave Hawaii's fragile islands a chance to recover from the effects of surging tourism. Can a new balance be struck to protect the island?