A classic series of films exploring nature and man in various cultural and historical contexts. Beginning in the 1960s (when they aired on CBS), the specials set a standard for vivid documentary filmmaking and the many 'Nat'l Geo' prizes include Emmys for 'Mysteries of the Mind' and 'The Invisible World.' With the advent of cable, the specials evolved into two series before the creation of the National Geographic Channel in 2001.