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A view in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Adult surf scoters (Melanitta perspicillata) in flight in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, Pacific Ocean, United States of America, North America

Northwest view of Grand Canyon South Rim Arizona from the top floor of the historic Watchtower, taken through glass window, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

The top floor of the historic Watchtower at Grand Canyon South Rim, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

Typical house on San Diego square in the downtown colonial walled city, UNESCO World Heritage Site, Cartagena, Colombia, South America

Old townhall at Plaza Santa Ana, Vegueta, UNESCO World Heritage Site, Las Palmas de Gran Canaria, Gran Canaria, Canary Islands, Spain, Atlantic, Europe

Sunrise view of the Acropolis of Athens, UNESCO World Heritage Site, a historic fortress on a rocky hill above Athens, Greece, Europe

Sunrise view of the Acropolis of Athens, UNESCO World Heritage Site, a historic fortress on a rocky hill above Athens, Greece, Europe

Adult dovekies (Little Auk) (Alle alle) at their breeding site amongst scree slopes at Rubini Rock, Tikhaya Bay, Hooker Island, Franz Josef Land, Russia, Arctic Ocean, Eurasia

Adult dovekie (Little Auk) (Alle alle) at their breeding site amongst scree slopes at Rubini Rock, Tikhaya Bay, Hooker Island, Franz Josef Land, Russia, Arctic Ocean, Eurasia

Religious pilgrims on the ferry Vasiley Kosyakov to the Russian Orthodox Solovetsky Monastery, Bolshoy Island, UNESCO World Heritage Site, Onega Bay, Arkhangel Oblast, Russia, Arctic, Europe

A view of the Russian Orthodox Solovetsky Monastery founded in 1436 by two monks on Bolshoy Island, UNESCO World Heritage Site, Onega Bay, Arkhangel Oblast, Russia, Arctic, Europe

Buddha in Cave 3 (Great New Monastery), Dambulla Cave Temples, UNESCO World Heritage Site, Dambulla, Sri Lanka, Asia

Guardian statue at Thuparama Dagoba, Mahavihara (The Great Monastery), Anuradhapura, UNESCO World Heritage Site, Sri Lanka, Asia

View of the Grand Canal from the rooftop terrace of the Fondaco dei Tedeschi, Rialto, Venice, UNESCO World Heritage Site, Veneto, Italy, Europe

Elevated view of Cusco (Cuzco) Cathedral, UNESCO World Heritage Site, Cusco (Cuzco), Cusco Province, Cusco Region, Peru, South America

Brunnich's guillemot (Uria lomvia) breeding and nesting site at Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

Brunnich's guillemot (Uria lomvia) in flight near breeding and nesting site at Cape Fanshawe in Svalbard, Norway, Arctic, Europe

Brunnich's guillemot (Uria lomvia) breeding and nesting site at Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

Brunnich's guillemot (Uria lomvia) breeding and nesting site at Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

Great frigatebird (Fregata minor) feeding on erupting green sea turtle (Chelonia mydas) hatchlings in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

Great frigatebird chick (Fregata minor) on the nest on North Seymour Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Captive Galapagos giant tortoise (Geochelone elephantopus) at the Charles Darwin Research Station, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Wild Galapagos giant tortoise (Geochelone elephantopus) at Urbina Bay, Isabela Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Scenic view of Leon Dormido (Sleeping Lion) Island off San Cristobal Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Lava lizard (Microlophus spp) in the Galapagos Islands Archipelago, UNESCO World Heritage Site, Ecuador, South America

Lava lizard (Microlophus spp) in the Galapagos Islands Archipelago, UNESCO World Heritage Site, Ecuador, South America

Pre Rup Temple, a Hindu temple at Angkor built in 961 for Khmer king Rajendravarman of laterite and sandstone, UNESCO World Heritage Site, Cambodia, Indochina, Southeast Asia, Asia

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult great blue heron (Ardea herodias cognata) feeding on green sea turtle hatchlings, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding on algae at low tide in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult great blue heron (Ardea herodias cognata) feeding on green sea turtle hatchlings, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult yellow warbler (Dendroica petechia aureola) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Sound and light show at the Temple of Philae, Trajan's Kiosk, UNESCO World Heritage Site, Agilkia Island, Aswan, Egypt, North Africa, Africa

Human shadows on the lava formation and rock forms on the island of Bartolome in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult striated Heron (Butorides striata) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult Swallow-tailed gull (Creagrus furcatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Colossi of Memnon, massive stone statues of Pharaoh Amenhotep III in the Theban Necropolis, UNESCO World Heritage Site, Luxor, Egypt, North Africa, Africa

The very colorful Galapagos land iguana (Conolophus subcristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult green sea turtle (Chelonia mydas agassizii) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The very colorful Galapagos land iguana (Conolophus subcristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Scene of the fish market in the port town of Puerto Ayora, Santa Cruz Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Male Great frigatebird (Fregata minor) in breeding plumage with greenish metalic sheen to feathers) North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

The endemic Opuntia cactus (Opuntia echios) cactus growing in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Greater flamingos (Phoenicopterus ruber) foraging for small pink shrimp in saltwater lagoon in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Nazca booby (Sula grantii) downy chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Nazca booby (Sula grantii) downy chick stretching its wings to gather strength for flight in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) in flight in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult red-footed booby (Sula sula) being attacked in flight by a great frigatebird (Fregata minor) in the Galapagos, UNESCO World Heritage Site, Ecuador, South America

Blue-footed booby (Sula nebouxii) courtship behavior in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

An adult Galapagos dove (Zenaida galapagoensis) on Espanola Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) mother and pup on San Cristobal Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lions (Zalophus wollebaeki) hauled out on Gardner Beach, Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Snorkeler with Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Snorkeler with Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) pup takes over a small fishing boat on Isabela Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The Stradun (Placa Ulica) and Tower of the Franciscan Monastery, Old Town (Stari Grad), UNESCO World Heritage Site, Dubrovnik, Dalmatia, Croatia, Europe

Historic Hanseatic quarter, UNESCO World Heritage Site, Bergen, Vestland, Norway, Scandinavia, Europe

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

View over the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Aerial of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Humpback whales, floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Aerial of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

View of O'Neill Butte on the left and Grand Canyon on the right from the edge of Cedar Ridge along the South Kaibab Trail, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Traghetto (gondola ferry) crossing the Grand Canal to the Fish Market of Rialto, Venice, UNESCO World Heritage Site, Veneto region, Italy, Europe

Al-Khasneh (The Treasury) seen from the Siq, the historic and archaeological Nabataean city of Petra, UNESCO World Heritage Site, Jordan, Middle East

Man riding a horse along the access track to the gorge of Petra, UNESCO World Heritage Site, Jordan, Middle East

The Siq, narrow gorge leading to the historic and archaeological Nabataean city of Petra, UNESCO World Heritage Site, Jordan, Middle East

Aqueduct in al-Siq (narrow gorge) that is the main entrance to the ancient city of Petra, UNESCO World Heritage Site, Jordan, Middle East

Volcano trekking, Stromboli, Aeolian Islands, UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Pinnacle Rock on Bartolome Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Statues and dome of the Baptistery at sunset, Piazza dei Miracoli (Piazza del Duomo), UNESCO World Heritage Site, Pisa, Tuscany, Italy, Europe

Sun setting at the Taj Mahal, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, South Asia, Asia