Many Glacier, Glacier National Park

Avalanche Gorge, Glacier National Park

Swirl, Glacier National Park

Moss, Glacier National Park

Iceberg Lake, Glacier National Park

Icebergs, Glacier National Park

Avalanche Lake, Glacier National Park

Logan Pass, Glacier National Park

Logan Pass, Glacier National Park

Logan Pass, Glacier National Park

Logan Pass, Glacier National Park

Townsite at Night

Townsite, Waterton Lakes National Park, Alberta, Canada

Cameron Lake, Waterton Lakes National Park

Foggy Morning Hike, Shenandoah National Park

Creepy Forest, Shenandoah National Park

Dragonfly, Yellowstone National Park

Lilypad, Yellowstone National Park

Black Sands Before Sunrise, Yellowstone National Park

Grand Prismatic Spring, Yellowstone National Park

Grand Prismatic Spring Sunrise, Yellowstone National Park

Grand Prismatic, Yellowstone National Park

Great Geyser at 3 AM, Yellowstone National Park

After the Eruption, Yellowstone National Park

Moonrise over Black Sands, Yellowstone National Park

Old Faithful at Sunset, Yellowstone National Park

Cave Features, Mammoth Cave National Park