Hikers on Harding Icefield trail. Kenai Fjords National Park, Alaska, USA. http://www.terragalleria.com/parks/np-image.kefj36777.html Hiker looking at ice wall at the terminus of Reid Glacier. Glacier Bay National Park, Alaska, USA. http://www.terragalleria.com/parks/np-image.glba36896.html Hiker looking at ice wall at the front of Reid Glacier. Glacier Bay National Park, Alaska, USA. http://www.terragalleria.com/parks/np-image.glba36895.html Hiker checks map on Root Glacier. Wrangell-St Elias National Park, Alaska, USA. http://www.terragalleria.com/parks/np-image.wrst6419.html Hiker with backpack standing on boardwalk. Congaree National Park, South Carolina, USA. http://www.terragalleria.com/parks/np-image.cosw37875.html Hiker with backpack looking at iceberg-filed lake, glaciers, and mountain, Mt Edith Cavell. Jasper National Park, Canadian Rockies, Alberta, Canada http://www.terragalleria.com/north-america/canada/jasper/picture.caab33865.html Fisherman hiking out from lake with full gear. Alaska, USA http://www.terragalleria.com/america/alaska/seward-highway/picture.alas37235.html Hiker silhouetted, lower Dusy Basin. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.kica39721.html Father and son at Long Lake, John Muir Wilderness. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.usca39827.html Hiker standing on a rock overlooking Peyto Lake. Banff National Park, Canadian Rockies, Alberta, Canada http://www.terragalleria.com/north-america/canada/banff/picture.caab33694.html Hiker and saguaro cactus, Hugh Norris Trail. Saguaro National Park, Arizona, USA. http://www.terragalleria.com/parks/np-image.sagu32843.html Hiker checks map on Root Glacier. Wrangell-St Elias National Park, Alaska, USA. http://www.terragalleria.com/parks/np-image.wrst6418.html Hiker reaches for item in backpack on Root Glacier. Wrangell-St Elias National Park, Alaska, USA. http://www.terragalleria.com/parks/np-image.wrst6420.html Hiker standing on top of Round Top Peak. Mokelumne Wilderness, Eldorado National Forest, California, USA http://www.terragalleria.com/california/picture.usca9802.html Switchback on trail, with Grinnel Lake and Josephine Lake in the background. Glacier National Park, Montana, USA. http://www.terragalleria.com/parks/np-image.glac34116.html Hiker on a trail below Angel Glacier. Jasper National Park, Canadian Rockies, Alberta, Canada http://www.terragalleria.com/north-america/canada/jasper/picture.caab33801.html Hiker with backpack surveying Grinnell Glacier. Glacier National Park, Montana, USA. http://www.terragalleria.com/parks/np-image.glac34127.html Women hiking on the Grinnell Glacier trail. Glacier National Park, Montana, USA. http://www.terragalleria.com/parks/np-image.glac34109.html Couple hiking on trail, with Grinnell Lake below. Glacier National Park, Montana, USA. http://www.terragalleria.com/parks/np-image.glac34105.html Hikers go down Round Top Mountain. Mokelumne Wilderness, Eldorado National Forest, California, USA http://www.terragalleria.com/california/picture.usca9798.html Hiker in narrow passage between rock walls, the Needles. Canyonlands National Park, Utah, USA. http://www.terragalleria.com/parks/np-image.cany10655.html Hiker wearing backpack looking at Peyto Lake. Banff National Park, Canadian Rockies, Alberta, Canada http://www.terragalleria.com/north-america/canada/banff/picture.caab33699.html Hiker on moraine near Grinnell Glacier. Glacier National Park, Montana, USA. http://www.terragalleria.com/parks/np-image.glac34128.html Hikers looking at map and pointing, Dusy Basin. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.kica39715.html Hikers below Round Top Mountain. Mokelumne Wilderness, Eldorado National Forest, California, USA http://www.terragalleria.com/california/picture.usca9799.html Hiking down the Grinnell Glacier trail, afternoon. Glacier National Park, Montana, USA. http://www.terragalleria.com/parks/np-image.glac34114.html Backpackers in Nidever canyon , San Miguel Island. Channel Islands National Park, California, USA. http://www.terragalleria.com/parks/np-image.chis10716.html Hikers on trail above Lake Josephine. Glacier National Park, Montana, USA. http://www.terragalleria.com/parks/np-image.glac34104.html Backpacker going up Nidever canyon trail, San Miguel Island. Channel Islands National Park, California, USA. http://www.terragalleria.com/parks/np-image.chis10715.html Backpacker on beach, Cuyler harbor, San Miguel Island. Channel Islands National Park, California, USA. http://www.terragalleria.com/parks/np-image.chis10710.html Walking under a small waterfall on the Grinnell Glacier trail. Glacier National Park, Montana, USA. http://www.terragalleria.com/parks/np-image.glac34108.html Wood Creek suspension creek, Kings Canyon National Park. California http://www.terragalleria.com/mountain/mountain-image.kica5810.html Two backpackers descending on trail near Logan Pass. Glacier National Park, Montana, USA. http://www.terragalleria.com/parks/np-image.glac34172.html Hiker walking on Wood Creek suspension footbridge, Kings Canyon National Park. California http://www.terragalleria.com/mountain/mountain-image.kica5809.html Hiker standing on top of Round Top Mountain. Mokelumne Wilderness, Eldorado National Forest, California, USA http://www.terragalleria.com/california/picture.usca9800.html Hiker sitting on top of Round Top Mountain. Mokelumne Wilderness, Eldorado National Forest, California, USA http://www.terragalleria.com/california/picture.usca9801.html Hiking group posing in Dusy basin. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.kica39819.html Hiker and cables on the regular route to Half-Dome. Yosemite National Park, California http://www.terragalleria.com/mountain/mountain-image.yose11563.html Group hiking on the Grinnell Glacier trail. Glacier National Park, Montana, USA. http://www.terragalleria.com/parks/np-image.glac34107.html Hiker on a hill below Reid Glacier. Glacier Bay National Park, Alaska, USA. http://www.terragalleria.com/parks/np-image.glba36889.html Father and son on trail above Long Lake, John Muir Wilderness. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.usca39828.html Hikers crossing stream on rocks at Long Lake, John Muir Wilderness. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.usca39826.html Hikers on trail below Biship Pass, Dusy Basin. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.kica39820.html Hiker looking at map in front of lake, lower Dusy Basin. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.kica39722.html Hiker with map near lake, lower Dusy Basin. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.kica39723.html Father and son hiking on granite slab, Le Conte Canyon. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.kica39743.html Horseman speaking with hikers, Dusy Basin. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.kica39720.html Hikers pointing, Dusy Basin. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.kica39716.html Man filtering water from stream, John Muir Wilderness. Kings Canyon National Park, California http://www.terragalleria.com/mountain/mountain-image.usca39836.html Man and woman pausing with backpacks below the East face of Mt Whitney. California http://www.terragalleria.com/mountain/mountain-image.sequ11541.html