GREAT NATURAL MONUMENTS - GRAND CANYON

In GREAT NATURAL MONUMENTS – GRAND CANYON, passionate geologists Karl Karlstr�m and Laura Crossey take a fascinating journey along the Colorado River to uncover the secrets of this natural monument, which still has much to reveal. Accompanied by "river runner" Glade Zarn, who knows the river like the back of his hand, and naturalist Geoff Carpenter, Karl and Laura embark on an eight-day boat trip. They follow in the footsteps of Civil War Veteran John Wesley Powell, who in 1869 embarked on what he then called the "Great Unknown," considered by many to be the last epic adventure on American soil.