Jack Dykinga / Toroweap Overlook in sunrise light illuminating rim rocks with Colorado River far below, Grand Canyon National Park, Arizona, USA.

Jack Dykinga / Toroweap Overlook in sunset light illuminating rim rocks with Colorado River far below. Grand Canyon National Park, Arizona, USA.

Floris van Breugel / Barrel cacti (Ferocactus pilosus) and Ocotillo overlook Palm oasis at sunrise, Anza-Borrego Desert State Park, California, USA March

Tim Fitzharris / Deciduous forest and cliff in fall, Petit Jean State Park, Arkansas

Tim Fitzharris / Deciduous forest in fall, Ozark-Saint Francis National Forest, Arkansas

Tim Fitzharris / Deciduous forest in fall, Ozark-Saint Francis National Forest, Arkansas

Kirkendall-Spring / View over the Campbell Lakes with stormy clouds at dusk, viewed from Walker Valley Overlook in Hart Mountain National Antelope Refuge, Oregon, USA, May 2013.

Kirkendall-Spring / Canopy of autumn trees and rising fog viewed from Webb Overlook along the Newfound Gap Road in Great Smoky Mountains National Park, North Carolina, USA, October 2008

Ross Hoddinott / 2020VISION / Close-up of group of toadstools (Mycena sp) autumn. Leicestershire, UK. November. Photographer quote: 'It is all too easy to overlook the fascinating miniture world underneath our feet - mosses,...

Tim Fitzharris / Sunrise as seen from Toroweap Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Teton Range at Snake River Overlook, Grand Teton National Park, Wyoming

George Sanker / Calcite Springs Overlook, view of Grand Canyon of Yellowstone in evening light. Yellowstone National Park, Wyoming, USA. June 2018.

Chase Dekker / Hikers near glacial lake, Moraine Lake, Banff National Park, Alberta, Canada

David Fleetham / View across crater of dormant Haleakala / East Maui Volcano. Haleakala National Park, Maui, Hawaii. March 2016.

Tim Fitzharris / River in canyon, Green River from Green River Overlook, Canyonlands National Park, Utah

Ashley Cooper / People in canoes on Moraine Lake in the Canadian Rockies, Banff National Park, Canadian Rockies, Alberta, August 2012.

Ashley Cooper / Tourists overlooking the Peyto Lake, Banff National Park, Canadian Rockies, Alberta, August 2012.

Ashley Cooper / Peyto Lake, Banff National Park, Canadian Rockies, Alberta, August 2012.

Ashley Cooper / Peyto Lake, Banff National Park, Canadian Rockies, Alberta, August 2012.

Ashley Cooper / Peyto Lake, Banff National Park, Canadian Rockies, Alberta, August 2012.

Ashley Cooper / Moraine Lake, Banff National Park, Alberta, Canada, August 2012.

Ashley Cooper / Man looking out over Moraine Lake in the Banff National Park, Alberta, Canada, August 2012.

Ashley Cooper / Moraine Lake, Banff National Park, Alberta, Canada, August 2012.

Ashley Cooper / Canoes on Lake Louise, Banff National Park, Alberta, Canada, August 2012.

Ashley Cooper / Canoes on Lake Louise, Banff National Park, Alberta, Canada, August 2012.

Ashley Cooper / Moraine Lake, Banff National Park, Alberta, Canada, August 2012.

Jack Dykinga / Saddle Mountain overlook (Saddle Mountain at left) at dawn with water filled rim-rock in the foreground. Grand Canyon National Park, Arizona, USA.

David Fleetham / Panoramic view from Kalahaku Overlook across Haleakala Crater, Haleakala National Park, Maui's dormant volcano, Hawaii. (Eight vertical images were stitched together in Photoshop to make this large fi...

David Fleetham / View from Kalahaku Overlook, from Haleakala Crater and Ka Lu'u o ka O'o Cone, Haleakala National Park, Maui's dormant volcano, Hawaii. Sliding sands trail can be seen behind the cone.

Mary McDonald / Darwin Lake, Tagus cove, overlook, Isabela Island, Galapagos Islands, Ecuador. Pacific Ocean

Tim Fitzharris / Canyon cliffs, The Window near Walhalla Overlook, North Rim, Grand Canyon National Park, Arizona

Tim Fitzharris / Grand Canyon from Desert View Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Grand Canyon from Desert View Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Grand Canyon from Desert View Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Grand Canyon from Desert View Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Colorado River, Desert View Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Butte and canyon cliffs, Grand Canyon, Desert View Overlook Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Butte and canyon cliffs, Grand Canyon, Desert View Overlook Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Butte and canyon cliffs, Grand Canyon, Desert View Overlook Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Deciduous forest and cliff in fall, Petit Jean State Park, Arkansas

Tim Fitzharris / Deciduous forest in fall, Petit Jean State Park, Arkansas

Tim Fitzharris / Butte, Bryce Canyon National Park, Utah

Thomas Lazar / Lower canyon and flat plateaus, Green River Overlook, Island in the Sky section, Canyonlands National Park, Utah, Colorado Plateau, April 2010.

Kirkendall-Spring / Juniper tree (Juniperus) at Buena Vista Overlook in the Malheur National Wildlife Refuge, Oregon, USA, May 2013.

Kirkendall-Spring / Juniper tree (Juniperus) with double rainbow at Buena Vista Overlook in the Malheur National Wildlife Refuge, Oregon, USA, May 2013.

Kirkendall-Spring / Juniper tree (Juniperus) with rainbow and clouds, at Buena Vista Overlook in the Malheur National Wildlife Refuge, Oregon, USA, May 2013.

Kirkendall-Spring / Sunrise at Buena Vista Overlook in the Malheur National Wildlife Refuge, Oregon, USA, May 2013.

Kirkendall-Spring / Clouds at sunrise over the Malheur National Wildlife Refuge from Buena Vista Overlook, Oregon, USA, May 2013.

Jouan Rius / Green River Canyon from Green River overlook, Island in the Sky, Canyonlands National Park, Utah, USA December 2012

Kirkendall-Spring / View of the Teton Range from Blacktail Ponds Overlook, with flowers in foreground, Grand Teton National Park. Wyoming, USA, July 2011

Kirkendall-Spring / View of the Teton Range from Blacktail Ponds Overlook, with flowers in foreground, Grand Teton National Park. Wyoming, USA, July 2011

Kirkendall-Spring / Canopy of autumn trees and rising fog viewed from Webb Overlook along the Newfound Gap Road in Great Smoky Mountains National Park, North Carolina, USA, October 2008

Jerry Monkman / Mooselookmeguntic Lake viewed from the Appalachian Trail at the Height of Land overlook on ME 17, Rangeley, Maine, USA, September 2009

Jeff Vanuga / Green River Overlook in Canyonlands National Park, Utah, USA, November 2010.

Tim Fitzharris / Grand Canyon seen from Toroweep Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Wilkes Point at sunset with palm trees, Roatan Island, Honduras

Tim Fitzharris / Wilkes Point at sunset with palm trees, Roatan Island, Honduras

Tim Fitzharris / Organ Pipe Cactus (Stenocereus thurberi) overlooking Chelino Bay, Baja California, Mexico

George Sanker / Calcite Overlook, formed by the Yellowstone River, after a thunderstorm at sunset, Yellowstone National Park, Wyoming, USA, June 2008

Albert Lleal / Cross on overlook with Montserrat Basilica in the background, Montserrat Natural Park, Catalonia, Barcelona, Spain

Scott Leslie / Coastal granite rocks, Cape Breton Highlands National Park, Gulf of St. Lawrence, Nova Scotia, Canada

Tim Laman / Shark River Slough, near Pay-hay-okee Overlook, Everglades National Park, Florida, USA. April 2008

Tim Laman / Shark River Slough, near Pay-hay-okee Overlook, Everglades National Park, Florida, USA. April 2008

Yva Momatiuk & John Eastcott / View from Toroweap Overlook, Grand Canyon National Park, Arizona

Jerry Monkman / Full moon sets behind the Tetons, Snake River Overlook, Grand Teton NP, Wyoming, USA

Yva Momatiuk & John Eastcott / King Penguin (Aptenodytes patagonicus) chicks crowding on gravel beach near river mouth, Antarctic Bay, South Georgia Island

Tim Fitzharris / Grand View Point at dusk, Canyonlands National Park, Utah

Tim Fitzharris / Overlooking erosional formations called hoodoos, Bryce Canyon National Park, Utah

Tim Fitzharris / Conifers overlooking Bryce Canyon National Park, Utah

Tim Fitzharris / Autumn deciduous forest from the Blue Ridge Parkway, North Carolina

Tim Fitzharris / Pinnacles Overlook, Cumberland Gap National Historical Park, Kentucky

Tim Fitzharris / Broadleaf forest in fall colors as seen from Buck Hollow Overlook, Skyline Drive, Shenandoah National Park, Virginia

Tim Fitzharris / Broadleaf forest in fall colors as seen from Doyles River Overlook, Shenandoah National Park, Virginia

Yva Momatiuk & John Eastcott / Dramatic big cumulus clouds in blue sky over Grand Canyon at noon, Toroweap Overlook, Grand Canyon National Park, Arizona

Yva Momatiuk & John Eastcott / Colorful and dramatic cumulus clouds, red sandstone buttes and Colorado River canyon in evening, fall, Toroweap Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Aspen forest overlooking Fremont Lake, Bridger-Teton National Forest, Wyoming

Tim Fitzharris / Aspen forest overlooking Fremont Lake, Bridger-Teton National Forest, Wyoming

Tim Fitzharris / Junction Overlook and the Chinle Wash, Canyon de Chelly National Monument, Arizona

Tim Fitzharris / Book Cliff Overlook at dusk, Colorado National Monument, Colorado

Tim Fitzharris / Sandstone cliffs and canyon seen from Toroweap Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Single-leaf Pinyon Pine (Pinus monophylla) at Toroweap Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Aubrey Cliffs from Toroweap Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Colorado River under stormy sky seen from the Toroweap Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / Toroweap Overlook with a view of the Colorado River, Grand Canyon National Park, Arizona

Tim Fitzharris / Toroweap Overlook, Grand Canyon National Park, Arizona

Tim Fitzharris / View from Tsegi Overlook, Cayon de Chelly National Monument, Arizona

Tim Fitzharris / Blue Ridge Mountains from Bluff Mountain Overlook, North Carolina

Tim Fitzharris / Rio Grande from Big Hill Overlook, Big Bend Ranch State Park, Chihuahuan Desert, Texas

Tim Fitzharris / Rio Grande from Big Hill Overlook, Big Bend Ranch State Park, Chihuahuan Desert, Texas

Tim Fitzharris / Toroweep Overlook view of the Colorado River, Grand Canyon National Park, Arizona

Tim Fitzharris / Green River Overlook, Canyonlands National Park, Utah

Tim Fitzharris / Tsegi Overlook, Canyon de Chelly National Monument, Arizona

Tim Fitzharris / Deciduous forest in the autumn from Thunderstruck Ridge Overlook, Blue Ridge Parkway, North Carolina

Tim Fitzharris / White River Overlook showing sandstone striations and erosional features, Badlands National Park, South Dakota

Tim Fitzharris / White River Overlook showing sandstone striations and erosional features, Badlands National Park, South Dakota

David Welling / Larb Hollow overlook, Boulder Mountain, near Torrey, Utah, USA, winter 1993