To honor Koko's memory, National Geographic is republishing "Conversations With a Gorilla," our October 1978 cover story written by Francine Patterson, the psychologist who taught Koko how to sign.

Antelope Canyon is stunning, but there's another canyon nearby that offers unforgettable sights on small tours that give you ...

In this month’s Canyon Commentary, author Scott Thybony ponders the ancient story of a Hopi boy who embarks on an epic ...