Renowned violinist, music teacher, and conductor Itshak Perlman shares his life about becoming a one of the most celebrated musicians around the world.

Travel back to 1793 Philadelphia, when America's first circus was established, and witness its crash into American culture. The arrival of P. T. Barnum in 1871 transformed the trade, and the five Ringling brothers created a spectacle of their own.

Witness the beauty and danger of Nyirangongo as volcanonologists use high-end technology and study one of the most dangerous volcanoes in the world.

See an all-star concert honoring great artists like Neil Diamond, Tina Turner, and more.

Explore the internal mechanics of the human body through pioneering graphics and captivating scientific case studies. Witness the fascinating and finely tuned systems that keep the body motoring and the scientists guessing.

The competition is heating up as host Meredith Vieira searches for America's best-loved novel.