David Attenborough narrates this unique view of the planet from north to south.

Animals that have adapted to the special survival challenges of high-altitude life are featured.

Animals featured include snow geese, swimming monkeys, giant salamanders and river dolphins.

Cave systems around the world are home to geologic features and animals that remain largely unknown.

A tour of deserts features camels in the Gobi, guanacos in the Atacama and a bloom in Death Valley.

Animals living at the poles are featured, including killer whales, polar bears and emperor penguins.

The earth's extensive grasslands are featured, including the Sahel in Africa and the Asian steppes.

Among the rain-forest animals featured are jaguars, gibbons and flying frogs.

Plants take center stage in this exploration of coniferous and deciduous forests.

Spectacular storm photography is among the highlights of this exploration of the shallow seas.

The trees of the Taiga forest.

Animals featured include blue whales, vampire squid, dolphins, manta rays, lanternfish and tuna.

The making of the sprawling, ambitious series is documented. The show took three years to produce and required 2,000 days in the field and 71 cameramen filming across 204 locations in 62 countries.