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Detail of a mushroom coral (Fungia sp.) on a reef in Raja Ampat, Indonesia. This remote, tropical region is home to extraordinary marine biodiversity.

Limestone islands surround a beautiful lagoon in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

Limestone islands surround a beautiful lagoon in Raja Ampat, Indonesia. This remote region is known as the heart of the Coral Triangle due to its extraordinary marine biodiversity.

Cyerce elegans is one of the beautiful butterfly nudibranchs found in the Philippines, Anilao, Philippines.

Several pink anemones cluster on top of a coral outcropping providing homes for several anemone fish, Maldives.

A waterfall backlit by the midday sun, in a gorge in Bossiney Haven, near Tintagel, Cornwall, England, United Kingdom, Europe

Ice held up to the sun near the Antarctic Peninsula during the summer months, Southern Ocean, Polar Regions

Scenic view of hoodoos and rock formations, Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Waterfall pouring down a rocky cliff, with blurred motion, resulting from a slow shutter speed; at Welcombe Mouth, Hartland, north Devon, England, United Kingdom, Europe

View of the skeletal ruins of the A-Bomb Dome, Hypocenter, Hiroshima Peace Memorial, UNESCO, Hiroshima, Honshu, Japan

Meteora, ancient holy Monastery of Rousanos Saint Barbara and Holy Trinity, UNESCO, Kalabaka, Greece

Man looking at the magnificent sandstone rock structure in the Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Woman at Tomb of Lihyan, son of Kuza (Qasr al-Farid), carved into sandstone outcrop in Hegra, UNESCO, AlUla, Medina Province, Saudi Arabia

Hiker in front of mountain Portella at sunset, Gran Sasso e Monti della Laga National Park, Abruzzo, Italy, Europe

The last rays of sun disappear behind a rock face after a day of trekking in the Rila Mountains, Bulgaria, Europe

A trekker takes a break from the trail under the impressive northwest vertical wall of Monte Civetta in the Dolomites, Belluno, Veneto, Italy, Europe

Rear view of two young hikers admiring the Odle from the famous Adolf Munkel trail, Val di Funes, South Tyrol, Dolomites, Italy, Europe

A pink anemonefish, Amphiprion perideraion, swims above its beautiful host anemone in Wakatobi National Park, Indonesia.

A colorful soft coral adorns a giant clam, Tridacna sp., growing on a healthy reef in Raja Ampat, Indonesia.

Detail of the dome of St. Peter's Basilica, built by Michelangelo Buonarroti, completed by the architect Giacomo della Porta, within St. Peter's Basilica, Vatican City, UNESCO World Heritage Site, papal enclave in Rome, Lazio, Italy, Europe

Rear view of man with hat lying on grass, Alpe Bassetta, Valtellina, Sondrio, Lombardy, Italy, Europe

Sandstone buttes in Monument Valley Navajo Tribal Park on the Arizona-Utah border, United States of America, North America

East slopes of Haystack Mesa in Petrified Forest National Park, Arizona, United States of America, North America

California gray whale calf (Eschrictius robustus), with excited tourists in San Ignacio Lagoon, Baja California, Mexico, North America

A colorful crinoid clings to a coral reef slope in Komodo National Park, Indonesia. This tropical region in Indonesia is known for its spectacular coral reefs and high marine biodiversity.

Aerial view of beautiful limestone islands scattered about the seascape in Raja Ampat, Indonesia. This tropical area is known for its extraordinary marine biodiversity and is a popular destination for divers and snorkelers.

A brightly colored soft coral adorns prop roots in a blue water mangrove forest in Raja Ampat, Indonesia.

A beautiful coral reef thrives in shallow water in Indonesia's Banda Sea. This part of eastern Indonesia is home to part of the world's greatest marine biodiversity.

Looking down on the deep blue Katsura River, in the autumnal forests in Arashiyama of Kyoto, Honshu, Japan, Asia

A mountaineer looks up towards Cerro Fitz Roy, El Chalten Massif, Patagonia, Argentina, South America

Giants Causeway at sunset, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

The last rays of sun disappear behind a rock face after a day of trekking in the Rila Mountains, Bulgaria, Europe

Hiking next to the clear water of Elenino Lake near Maliovitsa in the Rila Mountains, Bulgaria, Europe

Sandstone buttes in Monument Valley Navajo Tribal Park on the Arizona-Utah border, United States of America, North America

Man enjoying the sunset in the giant sand dunes of the Sahara Desert, Timimoun, western Algeria, North Africa, Africa

A tube anemone grows on a sandy seafloor in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

Hikers admire Matterhorn reflected in Lake Stellisee on a starry night of full moon, Zermatt, Canton of Valais, Swiss Alps, Switzerland, Europe

Climber on south ridge of Dent Blanche, 4357m, with view to the Matterhorn, Valais, Swiss Alps, Switzerland, Europe

Bikers in plateau Campo Imperatore at sunset, Gran Sasso e Monti della Laga National Park, Abruzzo, Italy, Europe

Traveler at the canoe house of Lake Louise, Banff National Park, UNESCO World Heritage Site, Canadian Rockies, Alberta, Canada, North America

Hiker on summit of Lingmoor Fell, the Langdale Pikes beyond, Great Langdale, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

Detail of the spiral tentacles arrangement of a feather duster worm (Bispira sp.) in Komodo National Park, Indonesia.

Milky Way and person under Delicate Arch, Arches National Park, Moab, Grand County, Utah, United States of America, North America

Hiker at the church of San Domenico admires Lake Como framed by pink sky at dawn, Cremia, Lombardy, Italian Lakes, Italy, Europe

Tourists in backlight waiting for sunset. Haleakala National Park, Maui, Hawaii, United States of America, Pacific

Adult California gray whale (Eschrictius robustus), spy-hopping in San Ignacio Lagoon, Baja California, Mexico, North America

Sunset from the south rim of the Grand Canyon at Shoshone Point, UNESCO World Heritage Site, Arizona, United States of America, North America

The road leading up to Monument Valley Navajo Tribal Park on the Arizona-Utah border, United States of America, North America

Two tourists enjoying a beautiful sunset at Neist Point on the Isle of Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Sunrise at Font's Point, Anza-Borrego Desert State Park, California, United States of America, North America

Hikers amongst hoodoo formations on the Fairyland Trail in Bryce Canyon National Park, Utah, United States of America, North America

A hiker looks at Lake Pirola from above at sunrise, Chiareggio valley, Valmalenco, Valtellina, Lombardy, Italy, Europe

Kilchurn Castle reflected in Loch Awe at dawn in winter, Highlands, Scotland, United Kingdom, Europe

A couple walk through Zijin Cheng, The Forbidden City Palace Museum, UNESCO World Heritage Site, Beijing, China, Asia

A hiker admiring the pinnacles of the Dolomite Massif in the Puez-Odle Nature Park, South Tyrol, Italy, Europe

Man on rocks admires the rainbow on the winding road, Stelvio Pass, South Tyrol side, Valtellina, Lombardy, Italy, Europe

Woman enjoying the beautiful scenery, Ennedi Plateau, UNESCO World Heritage Site, Ennedi region, Chad, Africa

Arch of Constantine and Colosseum, South side, Colosseum to right, UNESCO World Heritage Site, Rome, Lazio, Italy, Europe