Half Dome and storm clouds at sunset, viewed from Sentinel Bridge, Yosemite National Park, California

Half Dome And Storm Clouds At Sunset, Yosemite Valley.

A rainbow appears in the mist of the Lower Falls of the Yellowstone River.  At 308 feet, the Lower Falls of the Yellowstone River is the tallest fall in the park.  This view is from Lookout Point on the North side of the Grand Canyon of the Yellowstone.  When conditions are perfect in midsummer, a midmorning rainbow briefly appears in the falls, Yellowstone National Park, Wyoming

Rainbow, Lower Yellowstone Falls, Grand Canyon Of The Yellowstone

Mesa Arch, Utah.  An exuberant hiker greets the dawning sun from atop Mesa Arch. Yup, that's me, Island in the Sky, Canyonlands National Park

Hiker atop Mesa Arch, Canyonlands National Park, Utah

A great white shark opens it mouth just before it attacks its prey with a crippling, powerful bite.  After the prey has been disabled, the shark will often wait for it to weaken from blood loss before resuming the attack.  If the shark looses a tooth in the course of the bite, a replacement just behind it will move forward to take its place, Carcharodon carcharias, Guadalupe Island (Isla Guadalupe)

An enormous great white shark, Guadalupe Island, Mexico, Carcharodon carcharias.

Mount Rainier is reflected in the calm waters of Reflection Lake, early morning, Mount Rainier National Park, Washington

Mount Rainier is reflected in the calm waters of Reflection Lake, Washington

Portrait of a young brown bear, pausing while grazing in tall sedge grass.  Brown bears can consume 30 lbs of sedge grass daily, waiting weeks until spawning salmon fill the rivers, Ursus arctos, Lake Clark National Park, Alaska

Young coastal brown bear, pausing while grazing in tall sedge grass, Lake Clark National Park, Alaska. Ursus arctos.

Two Adelie penguins, holding their wings out, standing on an iceberg, Pygoscelis adeliae, Paulet Island

Adelie penguins, Pygoscelis adeliae, on iceberg near Paulet Island, Antarctica.

Full moon rises over Seattle city skyline at dusk, Space Needle at right

Space Needle And City Skyline, Seattle

Oceanside Pier at dusk, sunset, night.  Oceanside

Oceanside Pier

Light Beam in Upper Antelope Slot Canyon.  Thin shafts of light briefly penetrate the convoluted narrows of Upper Antelope Slot Canyon, sending piercing beams through the sandstone maze to the sand floor below, Navajo Tribal Lands, Page, Arizona

Light Beam In Upper Antelope Slot Canyon, Navajo Tribal Lands

John Moulton barn at sunrise with Teton Range, on Mormon Row in Grand Teton National Park, Wyoming

John Moulton barn at sunrise with Teton Range, on Mormon Row in Grand Teton National Park, Wyoming.

Aerial photo of the West End of Catalina Island

Aerial Photo Of Catalina Island

San Diego city skyline at sunset, showing the buildings of downtown San Diego rising above San Diego Harbor, viewed from Harbor Island.  A panoramic photograph, composite of thirteen separate images

San Diego City Skyline Panorama

Downtown Los Angeles at night, street lights, buildings light up the night

Downtown Los Angeles At Night

San Diego Coronado Bridge, known locally as the Coronado Bridge, links San Diego with Coronado, California.  The bridge was completed in 1969 and was a toll bridge until 2002.  It is 2.1 miles long and reaches a height of 200 feet above San Diego Bay.  Coronado Island is to the left, and downtown San Diego is to the right in this view looking north

Aerial photo of the San Diego Coronado Bridge, which links San Diego with Coronado Island.

Crater Lake and Wizard Island at sunrise, Crater Lake National Park, Oregon

Crater Lake and Wizard Island at sunrise, Oregon

Sandhilll cranes in golden sunset light, silhouette, standing in pond, Grus canadensis, Bosque del Apache National Wildlife Refuge, Socorro, New Mexico

Sandhilll cranes in golden sunset light, New Mexico

Giant redwood, Lady Bird Johnson Grove, Redwood National Park.  The coastal redwood, or simply 'redwood', is the tallest tree on Earth, reaching a height of 379' and living 3500 years or more.  It is native to coastal California and the southwestern corner of Oregon within the United States, but most concentrated in Redwood National and State Parks in Northern California, found close to the coast where moisture and soil conditions can support its unique size and growth requirements, Sequoia sempervirens

Coastal Redwoods, Northern California

Rose Islet, Rose Atoll National Wildlife Sanctuary

Rose Island, Rose Atoll NWR, American Samoa

River Seine, Full Moon and Eiffel Tower at night, Paris. La Tour Eiffel. The Eiffel Tower is an iron lattice tower located on the Champ de Mars in Paris, named after the engineer Gustave Eiffel, who designed the tower in 1889 as the entrance arch to the 1889 World's Fair. The Eiffel tower is the tallest structure in Paris and the most-visited paid monument in the world

River Seine, Full Moon And Eiffel Tower At Night, Paris, Tour Eiffel

La Tour Eiffel. The Eiffel Tower is an iron lattice tower located on the Champ de Mars in Paris, named after the engineer Gustave Eiffel, who designed the tower in 1889 as the entrance arch to the 1889 World's Fair. The Eiffel tower is the tallest structure in Paris and the most-visited paid monument in the world

La Tour Eiffel, The Eiffel Tower, Paris

Paul W. Gabrielson, Ph.D, collecting algae and coral samples, Rose Atoll National Wildlife Sanctuary

Scientist surveying reef damage, Rose Atoll Marine National Monument, American Samoa.

The Citadel, medieval fortress overlooking Cairo

The Citadel, Cairo

Hotel del Coronado, known affectionately as the Hotel Del. It was once the largest hotel in the world, and is one of the few remaining wooden Victorian beach resorts. It sits on the beach on Coronado Island, seen here with downtown San Diego in the distance. It is widely considered to be one of Americas most beautiful and classic hotels. Built in 1888, it was designated a National Historic Landmark in 1977

Hotel Del Coronado, San Diego

San Diego bay and skyline at sunrise, viewed from Coronado Island

San Diego Bay And Skyline At Sunrise

Panoramic photo of San Diego embarcadero, showing the San Diego Marriott Hotel and Marina (center), Roy's Restaurant (center) and Manchester Grand Hyatt Hotel (left) viewed from the San Diego Embacadero Marine Park

Panoramic Photo Of San Diego Embarcadero

Mt. Whitney is the highest point in the contiguous United States with an elevation of 14,505 feet (4,421 m).  It lies along the crest of the Sierra Nevada mountain range.  Composed of the Sierra Nevada batholith granite formation, its eastern side (seen here) is quite steep.  It is climbed by hundreds of hikers each year

Mount Whitney, this highest point in the contiguous United States (14,505').

M/V Polar Star, an icebreaker expedition ship, lies at anchor in Right Whale Bay, South Georgia Island.  Antarctic fur seals on the beach, and the rugged South Georgia Island mountains in the distance.  Sunset, dusk, Arctocephalus gazella

Tourist ship at anchor off South Georgia Island, Southern Ocean

British Museum central foyer and ceiling, London, United Kingdom

Central Foyer, British Museum, London

Zodiac cruising in Antarctica.  Tourists enjoy the pack ice and towering glaciers of Cierva Cove on the Antarctic Peninsula

Zodiac cruising in Antarctica

Radio City Music Hall, neon lights, night, New York City

Radio City Music Hall, New York City

Downtown Los Angeles at night, street lights, buildings light up the night

Downtown Los Angeles At Night

North Pacific humpback whale rounds out in front of whale watching boat, Megaptera novaeangliae, Maui

Whale Watching, Maui, Hawaii

Land visit and sunset, skiff and tourists, Floreana Island

Landing On Floreana Island, Galapagos

Furnas, a small town on Sao Miguel Island

Furnas, Sao Miguel Island, Azores

A container ship leaves San Francisco Bay, passing under the Golden Gate Bridge, viewed from the Marin Headlands with the city of San Francisco in the distance.  Late afternoon

Golden Gate Bridge From Marin Headlands, San Francisco