In 1803, when the United States purchased Louisiana from France, the great expanse of this new American territory was a blank-not only on the map but in our knowledge. President Thomas Jefferson keenly understood that the course of the nation's destiny lay westward and that a national "Voyage of Discovery" must be mounted to determine the nature and accessibility of the frontier. He commissioned his young secretary, Meriwether Lewis, to lead an intelligence-gathering...

With stunning footage and cutting-edge technology, National Geographic explores the human body from the inside out as never before. Four classic programs look at how the incredible human machine works, from the miraculous in-utero development of a fetus to the mechanics of a beating heart, and from the formation of skin to the amazing way complicated systems work together for sensing, adapting, reproducing, regenerating, and thinking.

National Geographic explores the genetic journey of cats and dogs and examines the amazing relationship that has evolved over the years between people and these animals.

John Wayne plays Larry Baker, an air freight pilot whose father is the engineer on the Hurricane Express. When a train collision kills his father, Baker must determine who caused the wreck.