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Rolling Hills in Pleasant Valley in the Kaibab National Forest north of Grand Canyon North Rim Arizona near sundown.

Rolling Hills in Pleasant Valley in the Kaibab National Forest north of Grand Canyon North Rim Arizona near sundown.

View from the 80 foot tall historic Fire Watchtower at Jacob Lake Arizona. Maintained as a historic landmark by the National Forest Service. No property release needed.

Highway 67 facing north in Pleasant Valley of Kaibab National Forest Arizona near sundown after a rain. North of Grand Canyon North Rim.

The rolling hills of Pleasant Valley in the Kaibab National Forest north of Grand Canyon North Rim Arizona near sundown.

Lightning storm over Pleasant Valley in Kaibab National Forest Arizona, north of Grand Canyon North Rim.

View from the 80 foot tall historic Fire Watchtower at Jacob Lake Arizona. Maintained as a historic landmark by the National Forest Service. No property release needed.

View from the 80 foot tall historic Fire Watchtower at Jacob Lake Arizona. Maintained as a historic landmark by the National Forest Service. No property release needed.

Northern (Steller) sea lions, (Eumetopias jubatus), hauled out on South Marble Island, Glacier Bay National Park, Alaska, United States of America

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

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

View from the 80 foot tall historic Fire Watchtower at Jacob Lake Arizona. Maintained as a historic landmark by the National Forest Service. No property release needed.

View from the 80 foot tall historic Fire Watchtower at Jacob Lake Arizona. Maintained as a historic landmark by the National Forest Service. No property release needed.

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

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

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

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

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

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

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

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

Locals in a canoe on the Sangha river, Dzanga Sangha National Park, UNESCO, Central African Republic

Pygmy woman extracting water from a tree branch, Dzanga Sangha National Park, UNESCO, Central African Republic

Pygmy woman extracting water from a tree branch, Dzanga Sangha National Park, UNESCO, Central African Republic

Pygmy man preparing the net for net hunting, Dzanga Sangha National Park, UNESCO, Central African Republic

Pygmy man extracting water from a tree branch, Dzanga Sangha National Park, UNESCO, Central African Republic

View from the 80 foot tall historic Fire Watchtower at Jacob Lake Arizona. Maintained as a historic landmark by the National Forest Service. No property release needed.

The 80 foot tall historic Fire Watchtower at Jacob Lake Arizona. Maintained as a historic landmark by the National Forest Service. No property release needed.

The 80 foot tall historic Fire Watchtower at Jacob Lake Arizona. Maintained as a historic landmark by the National Forest Service. No property release needed.

The 80 foot tall historic Fire Watchtower at Jacob Lake Arizona. Sign warns to climb the tower at your own risk. Maintained as a historic landmark by the National Forest Service. No property release needed.

Storm clouds rolling in over Humphrey's Peak near Flagstaff Arizona in the Coconino National Forest. Viewed from US89.

Adult brown bear pair (Ursus arctos) mock-fighting at Scidmore Cut in Glacier Bay National Park, Alaska, United States of America

Durmitor mountain range, near Zabljak, Durmitor National Park, UNESCO World Heritage Site, Tramontana, Montenegro, Europe

Durmitor mountain range, near Zabljak, Durmitor National Park, UNESCO World Heritage Site, Tramontana, Montenegro, Europe

Adult snowshoe hare (Lepus americanus dalli) in Denali National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) scratching its back on tree, Brooks River, Katmai National Park, near Bristol Bay, Alaska, United States of America

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Directional sign pointing the way to Point Imperial and Cape Royal, Grand Canyon National Park, Arizona, USA

Aerial view of Govetts Leap Lookout, Blackheath area, Blue Mountains National Park near Sydney in New South Wales, Australia, Pacific

Tourist woman relaxing after hiking and enjoying panoramic views of granite boulders rock formations from Baltzer Lookout in Blue Mountains National Park near Sydney, New South Wales, Australia, Pacific

Lodore Falls waterfalls, Borrowdale Valley, Lake District National Park, UNESCO, Cumbria, England, United Kingdom

Spring flowers blooming in the fields surrounding the Puez-Odle National Park, Dolomites, South Tyrol, Italy, Europe

Aerial view over Exmoor National Park coastline, Lynton and Lynmouth, North Devon, England, United Kingdom, Europe

Lower Yellowstone Falls, Yellowstone National Park, Wyoming, United States of America, North America

Sunrise over the frozen Otto Lake and snowy mountains of Denali National Park in the background, Alaska, United States of America, North America

Alaskan Railroad going through Denali National Park in the winter, Alaska, United States of America, North America

Lake Crescent, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America