The Pacific Crest Trail stretches some 4,285km, tracing the mountains along the West Coast of the United States between Mexico and Canada. An epic hike, it follows the ridgelines of the Sierra Nevada and Cascade mountain ranges through the states of California, Oregon and Washington, a rugged wilderness populated by bears, mountain lions and rattlesnakes. The trail was first proposed prior to World War II, but it took until 1993 for the US Forest Service and its advocates to complete construction.