Tuesday at 7:00 p.m.

Henry Louis Gates, Jr. maps the roots of actor Kate Burton and media mogul Barry Diller.

Tuesday at 8:00 p.m.

Robert Leroy Parker and Harry Alonzo Longabaugh, better known as Butch Cassidy and the Sundance Kid, form the Wild Bunch gang and pull off the longest string of holdups in history.

Tuesday at 9:00 p.m.

Explore the story of writer Julia Alvarez, who blazed a trail for a generation of Latino authors.

Wednesday at 7:00 p.m.

The annual flood has finally arrived at Okavango Delta, bringing new challenges for the big cats.

Wednesday at 8:00 p.m.

Follow the relentless quest that led to a breakthrough treatment for a deadly disease.

Wednesday at 9:00 p.m.

Tracking how the polar world is transforming, from scaling jagged peaks to descending deep into the ice sheet.

Thursday at 8:00 p.m.

Father Brown and Flambeau hunt for a priceless holy relic that has been stolen from the church, as a new nemesis lurks in the shadows.