1500 years before the construction of the Ming Dynasty wall was constructed, the Han Dynasty defended the borders of China from invaders with a Great Wall of their own.
Bull sharks can swim from salt water into fresh water, and on the coast of South of Africa these sharks occasionally encounter Africa's deadliest animal, the hippo.
Embark on this virtual reality experience with an international coalition of biologists, geologists, glaciologists, meteorologists, and geographers as they study the effects of climate change in one of the most extreme environments on Earth.
Immerse yourself with a team of scientists, climbers, and Sherpa guides as they embark on an expedition that will help define our understanding of high-mountain environments.
Hundreds of millions of people in the Himalayan region rely on glaciers for their water supply. Global climate change is forcing many to leave their homes in search of new beginnings.
More than half of the migratory bird species in North America are declining. In order to conserve these migrating birds, conservation scientist and National Geographic explorer Kristen Ruegg is tracking bird DNA with the Bird Genoscape Project.
INTO THE FIRE follows an all-female team of Yazidi mine clearers in Iraq, working to rid the land of IEDs left behind by ISIS and to heal themselves in the process.