Tourist admiring the Giant Sequoia trees (Sequoiadendron giganteum), on the Big Trees trail, Round Meadow, Sequoia National Park, Sierra Nevada, California, United States of America, North America

Tourist admiring the Giant Sequoia trees (Sequoiadendron giganteum), hiking on the Big Trees trail, Round Meadow, Sequoia National Park, Sierra Nevada, California, United States of America, North America

Tourist hiker, admiring the Giant Sequoia trees (Sequoiadendron giganteum), known as the Parker Group, Sequoia National Park, Sierra Nevada, California, United States of America, North America

Small American black bear (Ursus americanus) with rare white chest markings, on the Big Trees trail, Round Meadow, Sequoia National Park, Sierra Nevada, California, United States of America, North America

Panorama of Bell Rock and Courthouse Butte, viewed from Big Park Loop Trail, Sedona, Arizona, United States of America, North America

Akaka Falls hiking trail, Big Island, Hawaii, United States of America, North America

Trunks of two redwoods, coast redwood forest (Sequoia sempervirens), dense vegetation, Jedediah Smith Redwoods State Park, Simpson-Reed Trail, California, USA, North America

Young man on a hiking trail through forest with coast redwoods (Sequoia sempervirens) and ferns, dense vegetation, Jedediah Smith Redwoods State Park, Simpson-Reed Trail, California, USA, North America

Young woman hugging a fat Western Red Cedar (Thuja gigantea), size comparison, Grove of the Patriarchs Trail, Mount Rainier National Park, Washington, USA, North America

Downhill mountain biker rides the Big Spruce Trail at Alyeska Resort in Girdwood, Alaska June 2011.

A woman trail runs up Big Creek in the Selway-Bitterroot Wilderness, Montana, Big Creek, Montana, USA

Downhill mountain biker rides the Big Spruce Trail at Alyeska Resort in Girdwood, Alaska June 2011.

A man rides his fat tire bike along a partially snow covered rocky section of the Crest Trail in Big Cotton Wood Canyon, Utah.

Downhill mountain biker rides the Big Spruce Trail at Alyeska Resort in Girdwood, Alaska June 2011.

California, Big Basin State Park, Man in orange jacket hiking in the redwoods.

California, Big Basin Redwoods State Park, Man biking on trail in woods.