Explore the most extraordinary places on the planet in this three-part series. Visit six continents to learn how these natural wonders evolved and hear rarely told stories about the challenges their inhabitants face.

Extreme Wonders
Visit extreme locales, including Mount Everest’s Khumbu Icefall and its dangers to sherpas, the Grand Canyon, where conservationists try to ensure a condor chick’s survival, and the slopes of Mount Kilimanjaro, where farmers battle with elephants.