When this great spine-like mountain range rose from the sea, it created a new continent and a bridge that joined North and South America, allowing flora and fauna from each to mix and diversify. Today, the Andes continue to grow and evolve and are home to a rich tapestry of environments, including the largest ice field outside the poles, a desert where penguins nest and vertical mile-high geysers where flamingos huddle for warmth.

Sunday, 10/7/07 from 8-9 p.m. ET
Thursday, 10/11/07 from 4:30-5:30 a.m. ET