Twisted Elk, originally uploaded by Pacific Landscapes.

Bull elk on a ridge in Lamar Valley at sunset. Yellowstone National Park, October 2009.

Firehole Canyon Falls, originally uploaded by Pacific Landscapes.

The edge of the falls, revealed by slow motion. Firehole River Falls, Yellowstone National Park, October 2009.

The Eye of God, originally uploaded by Pacific Landscapes.

No, not the Helix Nebula made famous by the Hubble Telescope. Grand Prismatic Spring is one of the three largest hot springs in the world, and the star attraction in Midway Geyser Basin in Yellowstone National Park, October 2009.