It was once known as "the place where Noah left his Ark": 1,500 square miles of lush floodplains in central Mozambique, packed with wild animals. But 15 years of civil war has taken a heavy toll-and many species have been almost completely wiped out. Journey with National Geographic to Mozambique's Gorongosa National Park and discover what is being done to bring this African oasis back to its former glory.

National Geographic presents a comprehensive view of the spectacular California coastal area known as Big Sur. Fly with the California condors and capture the panoramic view of Big Sur's many topside layers. Dive with California's sea otters to investigate life below the waves. Then, follow the stealthy mountain lions and see how the scavengers, the key-stone species and this top predator are all critical contributors to Big Sur's unique habitat.

They are giants-stretching more than 300 feet above the ground, with hidden gardens and mysterious predators thriving within their canopy. Climber Steve Sillett investigates their monster crowns while escaping crashing trees in the process. Down below, National Geographic Explorer-in-Residence Mike Fay charts the redwood range to size up the past and future of these primeval trees.

America's Great Plains were once a vibrant grassland ecosystem, akin to the great savannahs of Africa. Here, a mere 200 years ago, Lewis and Clark stepped onto this fertile landscape and were awestruck by what they saw-herds of bison, packs of wolves, grizzly bears, prairie dogs and more. Since Lewis and Clark's time, many of these iconic prairie creatures have all but disappeared. Now, one of the most ambitious conservation projects in American history is underway to create a thriving three million acre wildlife reserve that will restore "America's Serengeti." Filmed over 2 years in stunning high-definition, American Serengeti chronicles the massive restoration project and, through CGI, will fast forward to the future when vast herds of American wildlife will roam the plains once again. Narrated by Tom Selleck.

Follow the journey of a rebel named Black Wolf who breaks from his pack and survives to be one of the oldest wolves in Yellowstone. He'll travel paved roads most wolves avoid at all costs as he ventures out to mate with a rival pack's females. At nearly twice the age most wolves reach, Black Wolf's unorthodox lifestyle likely means he has more pups than any wolf in Yellowstone. National Geographic cameras capture the action when he finally achieves alpha male status in his own pack.

More than three times the height of Niagara Falls, much of Vietnam's Mountain River Cave has remained untouched by humans. With exclusive footage, National Geographic reveals, for the first time in history, astounding evidence that this could be the largest cave in the world. Together with renowned expedition leader Howard Limbert, cave geologist Darryl Granger uncovers the formula for how the cave grew so grand. And international zoologist Anette Becher identifies unique underground species that evolved there. Finally, the team climbs to the cave's ceiling. Will their readings help confirm that they have just ascended to the top of the World's Biggest Cave?