Our Great National Parks : Episode 3

From Africa's beaches to Japan's islands to Australia's Great Barrier Reef — the natural world's untamed beauty comes into gorgeous focus.

Encompassing 24 unique national parks, the magnificent Chilean Patagonia is rapidly becoming one of the most protected places on the planet.

California's vibrant coastline gets its close-up, with an emphasis on the delicate balance struck between wildlife and humanity.

Next stop: Gunung Leuser National Park in Indonesia — home to some of the most endangered species on Earth, including the rare Sumatran tiger.