In New York, Martin visits Manhattan, Ellis Island, and Coney Island. In Massachusetts, he stops in Martha's Vineyard and then chases great white sharks off the coast of Cape Cod. He ends his journey on several of Maine's remote islands.

Have lax laws left the for-profit adoption industry ripe for misconduct? FRONTLINE and Retro Report investigate how so-called baby brokers have targeted pregnant women and families looking to adopt, and an epicenter of the problem in Utah.

In Nepal, the crew uses thermal cameras to film tigers at night, revealing previously unseen behavior. A new tiger mom must keep her growing cub out of trouble, while another tigress’ cubs are stalked by the returning male “king” of Tiger Island.

From the first time two cells stuck together, evolution has been crafting new bodies—biological machines then put to the test by Earth's ever-changing environments. Discover the process behind the incredible variety of animal shapes and sizes.

B-29 DOC: History Restored tells the historic saga to bring a scrapped B-29 named "Doc" back to life.