Early morning on the Madison river. Yellowstone National Park.

Early morning on the Madison river. Yellowstone National Park.

The Madison river. Yellowstone National Park.

Blacktail plateau. Yellowstone National Park.

Sylvan lake. Yellowstone National Park.

Tower-Roosevelt. Yellowstone National Park.

Tower-Roosevelt. Yellowstone National Park.

Tower-Roosevelt. Yellowstone National Park.

Grand Canyon of the Yellowstone. Yellowstone National Park.

Grand Canyon of the Yellowstone. Yellowstone National Park.

Grand Canyon of the Yellowstone. Yellowstone National Park.

Geysers near Firehole Lake. Yellowstone National Park.

Lower geyser basin. Yellowstone National Park.

Geysers. Yellowstone National Park.

Geysers. Yellowstone National Park.

Geysers. Yellowstone National Park.

Geysers. Yellowstone National Park.

Old Faithful Geyser. Yellowstone National Park.

Geysers. Yellowstone National Park.

Geysers. Yellowstone National Park.

Geysers. Yellowstone National Park.

Geysers. Yellowstone National Park.

Geysers. Yellowstone National Park.

Geysers. Yellowstone National Park.

The aftermath of a forest fire. Yellowstone National Park.

Lamar valley. Yellowstone National Park.

Lamar valley. Yellowstone National Park.

Lamar valley. Yellowstone National Park.