A new three-part series from PBS and the BBC Natural History Unit, “Kingdoms of the Sky,” tells the story of the wildlife and people of the world’s greatest mountain ranges: the Rockies, the Andes, and the Himalayas.

• “The Rockies” airs July 11 at 8 p.m.

• “The Himalayas” airs July 18 at 8 p.m.

• “The Andes” airs July 25 at 8 p.m.