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Saguaro cactus (Cereus giganteus), Saguaro National Park (West), Tucson, Arizona, United States of America, North America

Norber erratics near Austwick, erratic boulders left on limestone pavement by erosion, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

The Neolithic Castlerigg Stone Circle at dawn, near Keswick, Lake District National Park, Cumbria, England, United Kigndom, Europe

Keskadale and Derwent Fells near Keswick, Lake District National Park, Cumbria, England, United Kingdom, Europe

Male sagebrush lizard (Sceloporus graciosus) looking at camera, Canyonlands National Park, Utah, United States of America, North America

Malham Cove, Malham, Yorkshire Dales National Park, North Yorkshire, England, United Kingdom, Europe

Reflections in Snake River, Grand Tetons National Park, Wyoming, United States of America, North America

Waterville Valley, White Mountain National Forest, New Hampshire, New England, United States of America, North America

Great blue heron (Ardea herodias) with fish, standing in water, Sanibel Island, J. N. Ding Darling National Wildlife Refuge, Florida, United States of America, North America

Narrow street in the seaside town of Whitby in the North York Moors National Park, Yorkshire, England, United Kingdom, Europe

The old historic harbour in evening summer sunshine, Tenby, Pembrokeshire National Park, West Wales, Wales, United Kingdom, Europe

The rolling hills of the South Downs National Park near to Brighton, Sussex, England, United Kingdom, Europe

View of salt marshes from the Solent Way footpath, New Forest National Park, Lymington, Hampshire, England, United Kingdom, Europe

View of National Gallery of Art on Pennsylvania Avenue, Washington D.C., United States of America, North America

Mountain bikers stop to consider their route around Loughrigg Fell in the Lake District National Park, Cumbria, England, United Kingdom, Europe

Meadow of glacier lilies, with the High Rocky Mountains behind, Glacier National Park, Montana, United States of America, North America

Rocks in the South Fork of the Kings River, with trees and crags in the background, in Cedar Gorge, Kings Canyon National Park, California, United States of America, North America

Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Fossil logs 200 million years old scattered over desert floor in National Park, Petrified Forest National Park, Arizona, United States of America (U.S.A.), North America

View east from Logan Pass, Glacier National Park, Montana, United States of America (U.S.A.), North America

Cadair Idris (Cader Idris) mountain and Gregennen Lake, National Trust area, Snowdonia National Park, Gwynedd, Wales, United Kingdom, Europe

Cooled lava from recent eruption, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

Woman looking over Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Keskadale and Derwent Fells near Keswick, Lake District National Park, Cumbria, England, United Kingdom, Europe

Cliffs of Hermaness National Nature Reserve, large gannetry at Saito, Unst, Shetland Islands, Scotland, United Kingdom, Europe

Scotty's Castle, a major attraction and historic home in Death Valley National Park, California, United States of America, North America

Still water on Crummock Water in the Lake District National Park, Cumbria, England, United Kingdom, Europe

A jetty at the edge of Derwent Water in the Lake District National Park, Cumbria, England, United Kingdom, Europe

Old cottage with colourful foliage in the Indian summer, Great Smoky National Park, Tennessee, United States of America, North America

Sagamore Hill, home of President Theodore Roosevelt, National Park, Oyster Bay, Long Island, New York, United States of America, North America

Lavender evening-primrose (Calyophus lavandulifolia), The Needles District, Canyonlands National Park, Utah, United States of America, North America

Mountain death camas (Elegant Deathcamas) (Alkali Grass) (Zigadenus elegans), Cottonwood Pass, Collegiate Peaks Wilderness, Gunnison National Forest, Colorado, United States of America, North America

River Fowey at Golitha Falls National Nature Reserve, sessile oak woodland, Bodmin Moor, Cornwall, England, United Kingdom, Europe

Sunrise, Ambleside, Lake Windermere, Lake District National Park, Cumbria, England, United Kingdom, Europe

Lava dome in crater seen from rim, Mount St. Helens after 1980 eruption, with Spirit Lake and Mount Rainier in the distance, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America

Ryan Lake and some of the millions of trees north of Mount St. Helens flattened by the eruption of 1980, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America

Spirit Lake in the landscape north of Mount St. Helens devastated by the 1980 eruption, Mount St. Helens National Volcanic Monument, Washington State, United States of America (U.S.A.), North America

Joshua trees near Death Valley, Joshua Tree National Park, California, United States of America, North America

View from the east of Croft Castle, a National Trust property, Herefordshire, England, United Kingdom, Europe

View from the National Gallery of St. Martin in the Fields, Trafalgar Square, London, England, United Kingdom, Europe

Lower Falls of Yellowstone River, 94m high at head of canyon, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Skylight, view through cooled lava to molten lava below, Kilauea Volcano, Hawaii Volcanoes National Park, Island of Hawaii (Big Island', Hawaii, United States of America, North America

Hot lava flowing onto beach and into the ocean, Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, Island of Hawaii (Big Island), Hawaii, United States of America, North America

The Racetrack Point, Death Valley National Park, California, United States of America, North America

The Racetrack Point, Death Valley National Park, California, United States of America, North America

Road towards Wensleydale valley, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Tomb of John F. Kennedy at Arlington National Cemetery, Arlington, Virginia, United States of America, North America

Tomb of Jackie Kennedy Onassis at Arlington National Cemetery, Arlington, Virginia, United States of America, North America

Narrow boats on the Liverpool Leeds canal at Skipton, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Moose Crossing Sign, White Mountain National Forest, New Hampshire, New England, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Rose Cottage, Plague Cottages, Plague Village, Eyam, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Bluebell (Campanula rotundifolia), Shoshone National Forest, Wyoming, United States of America, North America

Richardson's Geranium (Geranium richardsonii), Gunnison National Forest, Colorado, United States of America, North America

Walkers taking in the view on Hathersage Edge, Ladybower Reservoir below, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Old Point Loma lighthouse on the Cabrillo National Monument, Point Loma, San Diego, California, United States of America, North America

View of Memorial Amphitheatre in Arlington National Cemetery, Washington D.C., United States of America, North America

Snow on pinnacles and rock formations in the Bryce Canyon National Park in Utah, United States of America, North America

Bison, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Cake Rock on Rialto Beach, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Wooden seat on the rim of the Amphitheatre, in the Bryce Canyon National Park, Utah, United States of America, North America

The 11th century Church of St. Mary The Virgin at Friston, South Downs National Park, East Sussex, England, United Kingdom, Europe

Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

The Screes, Lake Wastwater, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe

Woman looking over Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Sunset on Elter Water, near Ambleside, Lake District National Park, Cumbria, England, United Kingdom, Europe

Tarn Hows, Helvellyn Range in distance, Lake District National Park, Cumbria, England, United Kingdom, Europe

Memorial to the crew of the Space Shuttle Challenger, Arlington National Cemetery, Arlington, Virginia, United States of America, North America

Pueblo ruins in Mesa Verde containing some of the most elaborte Pueblo dwellings found today, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

Ribblehead railway viaduct, on the Carlisle to Settle and Leeds cross-Pennine route, Yorkshire Dales National Park, Yorkshire, England, United Kingdom, Europe

Mountain bluebell (Mertensia ciliata), Yankee Boy Basin, Uncompahgre National Forest, Colorado, United States of America, North America

Tourists having a picnic, Shenandoah National Park, Virginia, United States of America, North America

Boats at the edge of Derwent Water in the Lake District National Park, Cumbria, England, United Kingdom, Europe

The still waters of Crummock Water in the Lake District National Park, Cumbria, England, United Kingdom, Europe

Camp 2, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Mountain death camas (Elegant Deathcamas) (Alkali Grass) (Zigadenus elegans), Glacier National Park, Montana, United States of America, North America

Redstem cinquefoil (Potentilla rubricaulis) bloom, Gunnison National Forest, Colorado, United States of America, North America

Governors Island, Park, National Historic Landmark Dstrict, New York City, New York Harbor, United States of America, North America

View of National Gallery of Art on Pennsylvania Avenue, Washington D.C., United States of America, North America

Steam train on route between Llanberis and the summit of Mount Snowdon in Snowdonia National Park, Gwynedd, Wales, United Kingdom, Europe