Great Sand Dunes National Monument and Sangre de Cristo Mountains, 700 ft dunes are the tallest in North America, Colorado, USA, North America

Great Gable 2949 ft, from Overbeck and Lake Wastwater, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe

Hanuman Tok, a highly revered and holy temple dedicated to Lord Hanuma (monkey god), located at an altitude of 7200 ft, Sikkim, India, Asia

Taipei cityscape as seen from Taipei 101, the world's eighth tallest building at 1667 ft, Taipei, Taiwan, Asia

Yewbarrow 2058 ft, from Over Beck Bridge, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe

View from Overbeck and Lake Wastwater to Lingmell, Scafell Pike 3210 ft and Scafell 3161 ft, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe

Sonora Pass, 9624 ft, on State Route 108, the second highest highway over the Sierras, Sierra Nevada mountains, California, United States of America, North America

Hiker on Maja Jezerce, standing at 2,694 metres (8,839 ft) above the Adriatic, the highest peak in the high Dinaric Alps, Albania, Europe

Watchman Mountain, 6545 ft, near Springdale, Utah, United States of America

Watchman Mountain, 6545 ft, near Springdale, Utah, United States of America

Angel's Landing, a 1500 ft high rock formation, Zion National Park, Utah, United States of America

Multnomah Falls, the tallest waterfall in the state of Oregon at 620 ft. in height, Columbia River Gorge, Oregon, United States of America, North America

Multnomah Falls, the tallest waterfall in the state of Oregon at 620 ft. in height, Columbia River Gorge, Oregon, United States of America, North America

Ruby Falls, 145 ft waterfall deep inside Lookout Mountain, Chattanooga, Tennessee, United States of America, North America

Landscape Arch, (height 92 ft, span 306 ft), Arches National Park, Utah, USA

Rock formation caused by erosion known as Delicate Arch, 45 ft high and 33 ft wide, in the Arches National Park in Utah, United States of America, North America

Delicate Arch (45 ft high, 33 ft wide), Arches National Park, Utah, USA

Landscape Arch, 92 ft. high, 306 ft. span, Arches National Park, Utah, USA, North America

Monch (13449 ft) mountain, Bernese Oberland, Swiss Alps, Switzerland, Europe

Snowy landscape in June, at Independence Pass, elevation 12095 ft, in the Sawatch Mountains, part of the Rockies, in Aspen, Colorado, United States of America, North America

Tunnel Log, 275 ft long, which fell in 1937, Sequoiadendron giganteum, Sequoia National Park, California, United States of America, North America

Jungfrau railway and the Jungfrau, 13642 ft., Bernese Oberland, Swiss Alps, Switzerland, Europe

Jungfrau railway and the Jungfrau, 13642 ft., Bernese Oberland, Swiss Alps, Switzerland, Europe

Pilgrim at the rock-hewn monolithic church of Bet Giyorgis (St. George's), 40 ft high, with roof in shape of Greek cross, Lalibela, UNESCO World Heritage Site, Ethiopia, Africa

The Old Faithful Geyser at Calistoga, erupts 60 ft high every 30 minutes, with a pressure of 1000 lbs per square foot, Napa Valley, California, United States of America, North America

Tourist viewing breathtaking views at 14000 ft, Simien Mountains, Ethiopia, Africa

Illimani, 21184 ft, near La Paz, Bolivia, South America

Ogham Stone of Ballycrovane, 17 ft (5.2 m) tall, tallest in Ireland, Ballycrovane, Beara peninsula, County Cork, Munster, Republic of Ireland, Europe

Upper Yosemite Falls cascades down the sheer granite walls of Yosemite Valley, the world's longest unbroken fall, with the famous 8842 ft Half Dome in the distance, Yosemite National Park, UNESCO World Heritage Site, California, United States of America (U.S.A.), North America

Part of the vast crater of 10023 ft Haleakala, the world's largest dormant volcano, seen from Sliding Sands trail, Maui, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

A pretty Victorian style mining town known as the Gem of the Rockies (Rocky Mountains) situated at 7800 ft. in the San Juan mountains with 5000 ft. cliffs rising around it, Ouray, Colorado, United States of America (U.S.A.), North America

City skyline with Battery Park at the southern tip of Manhattan and the World Trade Center, 100 storeys, 1350 ft tall, opened 1970, destroyed in September 2001, in New York, United States of America, North America

Pilgrims seated in front of the 39 ft high standing Buddha, Aukana, Sri Lanka, Asia

Man on summit of Mount Denali, 20320 ft, Alaska, United States of America, North America

Overbeck flows into Lake Wastwater, Great Gable 2949 ft in centre, Lake District National Park, Cumbria, England, United Kingdom, Europe

Young monk offers flowers, Aukana Buddha, 39 ft high, Sri Lanka, Asia

A Lakeland farm below Yewbarrow 2058 ft, Wasdale, Lake District National Park, Cumbria, England, United Kingdom, Europe

The road to the lake, Lake Ullswater, Birks, and St. Sunday Crag, 840 ft., Lake District National Park, Cumbria, England, United Kingdom, Europe

Leaning towers, Torre degli Asinelli 328 ft. and Torre Garisendi 164 ft., and 10 ft. tilt, Bologna, Emilia-Romagna, Italy, Europe

The Space Needle, 520 ft tall, Seattle, Washington State, United States of America, North America

Adult humpback whale (Megaptera novaeangliae) sub-surface feeding among black-legged kittiwakes (Rissa tridactyla) off the continental shelf west of Spitsbergen in the Barents Sea, Norway. Humpbacks are one of the larger rorqual species, adults range in length from 12?16 metres (40?50 ft) and weigh approximately 36,000 kilograms (79,000 lb). There are at least 80,000 humpback whales worldwide.

Split image of 21 ft catamaran in open ocean, Kailua-Kona, Hawaii, United States of America, Pacific

Adult humpback whale (Megaptera novaeangliae) sub-surface feeding among black-legged kittiwakes (Rissa tridactyla) off the continental shelf west of Spitsbergen in the Barents Sea, Norway. Humpbacks are one of the larger rorqual species, adults range in length from 12?16 metres (40?50 ft) and weigh approximately 36,000 kilograms (79,000 lb). There are at least 80,000 humpback whales worldwide.

Adult humpback whale (Megaptera novaeangliae) sub-surface feeding among black-legged kittiwakes (Rissa tridactyla) off the continental shelf west of Spitsbergen in the Barents Sea, Norway. Humpbacks are one of the larger rorqual species, adults range in length from 12?16 metres (40?50 ft) and weigh approximately 36,000 kilograms (79,000 lb). There are at least 80,000 humpback whales worldwide.

Aerial views of El Castillo and the Ruins of the Mayan temple grounds at Tulum, Quintana Roo, Yucatan, Mexico. Tulum is the site of a pre-Columbian Mayan walled city which served as a major port for Coba, in the Mexican state of Quintana Roo. The ruins are situated on 12 meter 39 ft tall cliffs along the east coast of the Yucatán Peninsula on the Caribbean Sea in the state of Quintana Roo, Mexico. Tulum was one of the last cities built and inhabited by the Maya; it was at its height between the 13th and 15th centuries and managed to survive about 70 years after the Spanish began occupying Mexico. Old World diseases brought by the Spanish settlers appear to have resulted in very high fatalities, disrupting the society, and eventually causing the city to be abandoned.

Aerial views of El Castillo and the Ruins of the Mayan temple grounds at Tulum, Quintana Roo, Yucatan, Mexico. Tulum is the site of a pre-Columbian Mayan walled city which served as a major port for Coba, in the Mexican state of Quintana Roo. The ruins are situated on 12 meter 39 ft tall cliffs along the east coast of the Yucatán Peninsula on the Caribbean Sea in the state of Quintana Roo, Mexico. Tulum was one of the last cities built and inhabited by the Maya; it was at its height between the 13th and 15th centuries and managed to survive about 70 years after the Spanish began occupying Mexico. Old World diseases brought by the Spanish settlers appear to have resulted in very high fatalities, disrupting the society, and eventually causing the city to be abandoned.

Ebola virus particles (blue) found both as extracellular particles and budding particles from chronically infected African green monkey kidney cells. Image captured and color-enhanced at the NIAID Integrated Research Facility in Ft. Detrick, Maryland.

Lighthouse on a landscape, Ft. Worden Lighthouse, Port Townsend, Washington State, USA

249 m or 817 ft-long Fuldatalbruecke Kragenhof (Fulda Valley Bridge Kragenhof), part of the ICE Hanover-to-Wuerzburg high-speed railway line near Kirchheim, Hesse, Germany, Europe

721 m or 2365 ft-long Waelsebachtalbruecke (Waelse Valley Bridge), part of the ICE Hanover-to-Wuerzburg high-speed railway line near Kirchheim, Hesse, Germany, Europe

Yerupaja Sur, Siula Grande, 20813 ft / 6344 m, and Sarapo, from left, Cordillera Huayhuash, Peru, South America

Aerial view of Mt. Kilimanjaro 19335 ft. or 5895 m, Rebmann Glacier in the foreground, crater floor, Tanzania, Africa

Aerial view of Mt. Kilimanjaro 19335 ft. or 5895 m, spectacular ice cliffs of the Eastern Icefield, Tanzania, Africa

Aerial view of Mt. Kilimanjaro 19335 ft or 5895 m, Reusch crater with ash cone and pit, Tanzania, Africa

Aerial view of Mt. Kilimanjaro 19335 ft. or 5895 m, Reusch Crater and ash pit, Tanzania, Africa

Aerial view of Mt. Kilimanjaro 19335 ft. or 5895 m, crater floor with ash cone and pit, Southern Ice field in the foreground, Tanzania, Africa

721 m or 2365 ft-long Waelsebachtalbruecke (Waelse Valley Bridge), part of the ICE Hanover-to-Wuerzburg high-speed railway line near Kirchheim, Hesse, Germany, Europe

Aerial view of Mt. Kilimanjaro 19335 ft. or 5895 m, Rebmann Glacier in the foreground, summit ridge and crater floor, Tanzania, Africa

Summit cross at 2962 m or 9718 ft on the Zugspitze, Germany's highest mountain, Wetterstein Range, Werdenfels Region, Upper Bavaria, Bavaria, Germany, Europe

Summit cross at 2962 m or 9718 ft on the Zugspitze, Germany's highest mountain, Wetterstein Range, Werdenfels Region, Upper Bavaria, Bavaria, Germany, Europe

Summit cross at 2962 m or 9718 ft on the Zugspitze, Germany's highest mountain, Wetterstein Range, Werdenfels Region, Upper Bavaria, Bavaria, Germany, Europe

Slides in a park, Cotanchobee Ft. Brooke Park, Tampa, Florida, USA

Ft. Peck has an existing herd of bison that are not genetically pure Yellowstone bison. These run in a pasture next to the Yellowstone bison. The pure bsion are being held in a 20-acre pen until they're released to into a fenced pasture.

Ft. Peck has an existing herd of bison that are not genetically pure Yellowstone bison. These run in a pasture next to the Yellowstone bison. The pure bsion are being held in a 20-acre pen until they're released to into a fenced pasture.

Ft. Peck has an existing herd of bison that are not genetically pure Yellowstone bison. These run in a pasture next to the Yellowstone bison. The pure bsion are being held in a 20-acre pen until they're released to into a fenced pasture.

Ft. Peck has an existing herd of bison that are not genetically pure Yellowstone bison. These run in a pasture next to the Yellowstone bison. The pure bsion are being held in a 20-acre pen until they're released to into a fenced pasture.

Mountaineers navigating through the Hillary Step on Mount Everest. The Hillary Step is a nearly vertical part (height around 40 ft) of upper Mount Everest. It lies almost at the top of the mountain, halfway from the "south summit" to the summit top, and is the last real challenge before the summit. It is reached by climbing the South East route. It was named after Sir Edmund Hillary, who was the first person, along with Tenzing Norgay, who passed it to reach the summit, Nepal

Elaina Arenz is carrying her mountainbike over a part of the trail that is not rideable in El Potrero Chico Park. El Potrero Chico means "The Little Corral". It is part of the Sierra Madre occidental and used to be under the sea. It is a unique geologic limestone formation with cliffs up to 2000 ft. high.

Tribal singers welcome the bison home. Yellowstone bison are unloaded to a pasture on the Ft. Peck Indian reservation. The frst time in history Yellowstone bison have returned to the tribes.

Yellowstone bison are unloaded to a pasture on the Ft. Peck Indian reservation. The frst time in history Yellowstone bison have returned to the tribes.

Tribal singers welcome the bison home. Yellowstone bison are unloaded to a pasture on the Ft. Peck Indian reservation. The frst time in history Yellowstone bison have returned to the tribes.

One kayaker dropping a 50 ft waterfall at Cascadas de Agua Azul, Chiapas, Mexico.

Tents illuminate the night 2,000 ft. below the summit of Mt. Kilimanjaro.

View of the summit of Pik Lenin(23,407ft., 7,134m.) from Base Camp, Atchik-Tash (11,812 ft., 3600m). The team bases out of this camp for the aclimitization process over the 3 weeks of the expedition in Kyrgyzstan.

Female hiker descending from Handies peak (14053 ft), San Juan mountains, Colorado, USA

Female hiker ascending the rocky south slopes of Lavender Col route on Mt. Sneffels (14150 ft), San Juan mountains, Colorado, USA

Tribal singers welcome the bison home. Ft. Peck tribal leaders and members went to the pen holding the Yellowstone bison Wednesday to celebrate their return to tribal lands.

One kayaker dropping a 50 ft waterfall in Cascadas de Agua Azul, Chiapas, Mexico.

Bonni Casteel carries her bike over an un-rideable part of a singletrack trail in El Potrero Chico Park in Mexico. El Potrero Chico means "The Little Corral". It is part of the Sierra Madre occidental and used to be under the sea. It is a unique geologic limestone formation with cliffs up to 2000 ft. high.

Extrem kayaker and world record waterfall holder (98,4 ft or 30 m) Tao Berman on a training day down the Skykomish river, Washington on July 15, 2002.

With the Yellowstone bison returning to the Ft. Peck Reservation, the Assiniboine and Sioux tribes held a winter round dance in a school gym.

View from summit of Mt. Sneffels (14150 ft), San Juan mountains, Colorado, USA

Sequoia National Park, CA. Giant Sequoias (Sequoiadendron giganteum) rise up through the clouds. Giant Sequoias can grow to over 200 ft tall and 100 ft wide. Some Giant Sequoias are 2000 to 3000 years old.

A Road sign on CA 178 between Trona and Death Valley National Park with snow covered Telescope Peak (11049 ft, 3369 m) in the background in Panamint Valley, California on february 15, 2004. Although Death Valley is considered the hottest place on earth some summits in the park receive few feet of snow every winter.

The 23-metre (75.5 ft) statue of Vishnu at Garuda Wisnu Kencana Cultural Park; Bali, Indonesia

Vallee de Lutour looking south with snow covered peak of Pic de Labas 2927 m / 9586 ft and Tuc de Mounges cliff south of Cauterets, Fast flowing river in foreground, Hautes-Pyrenees, Midi-Pyrenees, France

Vallee de Lutour, View south over lower valley with central snow covered peak of Pic de Labas 2927 m / 9586 ft south of Cauterets, Sparkling river and trees, Hautes-Pyrenees, Midi-Pyrenees, France

A group of people climbing on the Svolvaer Goat, 150-metre (490 ft), a jagged pinnacle high above the landscape of the Lofoten, Austvagoy, Lofoten Islands, Norway

View of green pasture with Falshofter lighthouse, Schleswig-Holstein, Germany