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The north entrance of the historic Johnson Canyon Railroad Tunnel, Kaibab National Forest of Arizona, USA

A narrow and overgrown section of the abandoned Johnson Canyon Railroad in the Kaibab National Forest of Arizona, USA

View of Johnson Canyon from the abandoned Johnson Canyon Railroad Grade in the Kaibab National Forest of Arizona, USA

The concrete foundation remains of the old Welch Train Station for the Johnson Canyon Railroad, Kaibab National Forest of Arizona, USA

Galapagos Land Iguana (Conolophus subcristatus), large lizard can can grow to five feet long and live for 60 years, South Plaza island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Adult rockhopper penguins (Eudyptes chrysocome chrysocome) at breeding and molting colony on New Island, Falkland Islands

Adult rockhopper penguins (Eudyptes chrysocome chrysocome) at breeding and molting colony on New Island, Falkland Islands

An adult neotropic cormorant (Nannopterum brasilianum), on New River near the Mesoamerican archaeological site of Lamanai, Belize

Adult male long-tailed meadowlark (Sturnella loyca) in breeding plumage on New Island in the Falkland Islands

Black-browed albatross (Thalassarche melanophrys) breeding colony on Carcass Island in the Falkland Islands

Black-browed albatross (Thalassarche melanophrys) breeding colony on Carcass Island in the Falkland Islands

Magellanic penguin (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Magellanic penguin (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Magellanic penguins (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Magellanic penguins (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Magellanic penguins (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Magellanic penguin (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Magellanic penguin (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Magellanic penguins (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Magellanic penguin (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

The fire watchtower on the summit of Apache Maid Mountain, Coconino National Forest, Arizona, United States of America

The frozen Campbell Draw Tank with approaching snow storm, Coconino National Forest, Arizona, United States of America

Dali's Hole at Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

Nurse sharks (Ginglymostoma cirratum), being fed in shark and ray alley, Caye Caulker, Mesoamerican Barrier Reef, Belize

Nurse shark (Ginglymostoma cirratum), on the sand in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Tarpon (Megalops atlaticus), underwater at feeding station inside the Mesoamerican Barrier Reef, Belize

African forest elephant (Loxodonta cyclotis), Dzanga Bai, Dzanga Sangha National Park, UNESCO, Central African Republic

African forest elephant (Loxodonta cyclotis), Dzanga Bai, Dzanga Sangha National Park, UNESCO, Central African Republic

Adult black-legged kittiwakes (Rissa tridactyla) on ice in the Svalbard Archipelago, Barents Sea, Norway

A tufted gray langur (Semnopithecus priam) showing a threat display in Polonnaruwa, UNESCO World Heritage Site, Sri Lanka, Asia

Osaka Castle in Japan. Overlooking the stone moat and reflecting water at Rokuban-yagura Turret on the outer walls.Framed by late autumanl foliage

A mother tufted gray langur (Semnopithecus priam), with her infant in Polonnaruwa, UNESCO World Heritage Site, Sri Lanka, Asia

Shoreline view of the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

View of the lake created by the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

View from below the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

View of the lake created by the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

View of the lake created by the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

Old water tank perched on a cliff overlooking the T-Bar Ranch Homestead in the Coconino National Forest of Arizona, United States of America

Wildebeests (Connochaetes taurinus) and plains zebras (Equus quagga) grazing, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Dogs by river, Ksar of Ait-Ben-Haddou, UNESCO, seen from opposite bank, Ounila River valley, Ouarzazate Province, Draa-Tafilalet region, Morocco

Hairy woodpecker (Leuconotopicus villosus), perched on tree trunk, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Continental drift between North American and Eurasian tectonic plates, Thingvellir National Park, UNESCO, in winter, Western Region, Iceland

People and continental drift of North American and Eurasian tectonic plates, Thingvellir National Park in winter, UNESCO, Western Region, Iceland

View of river, chapel and houses in Thingvellir National Park, UNESCO, in winter, Western Region, Iceland

View of river, chapel and houses in Thingvellir National Park, UNESCO, in winter, Western Region, Iceland

Continental drift between North American and Eurasian tectonic plates, Thingvellir National Park, UNESCO, in winter, Western Region, Iceland

Adult Atlantin puffin (Fratercula arctica) during breeding season, Isfjardardjup, Westfjords region, Northwestern Iceland

Adult Atlantin puffin (Fratercula arctica) during breeding season on Sumburgh Head, Shetlands, Scotland, United Kingdom

Adult rockhopper penguin (Eudyptes chrysocome) at nesting site on New Island, Falkland Islands, U.K. Overseas Protectorate, South America

Adult rockhopper penguins (Eudyptes chrysocome) at nesting site on New Island, Falkland Islands, U.K. Overseas Protectorate, South America

Adult male Grant's gazelles (Nanger granti) sparring inside Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

A pack of banded mongooses (Mungos mungo), near their den site in Tarangire National Park, Tanzania, East Africa, Africa