As the days grow shorter in the Arctic, Alaskans prepare for the harsh battle ahead.

Free solo climber Alex Honnold prepares to achieve his lifelong dream: scaling the 3,200-foot El Capitan in Yosemite National Park without a rope.

From a mysterious villa in Pompeii, to secret mantras in Nepal, Morgan Freeman sets out to uncover why secrecy and religion are often intertwined.

A tegu has tummy trouble, and a cockatiel’s check-up turns out to be anything but routine.

Two journalists traverse the Grand Canyon by foot, hoping this 750-mile walk will help them better understand one of America's most revered landscapes and the threats poised to alter it forever.

The story of the largest financial fraud in history as told by those who were there, including victims, employees, family members, FBI agents, and Bernie Madoff himself; includes archival news footage, photos and recordings.

The harrowing story of how oil rig workers escaped a massive fire in the Gulf of Mexico.

The inside story of how the most vicious drug cartel in the world was brought down.