This is my most popular photo. Palouse Falls is stunning, especially when you catch it in May and the surrounding hills are still green; a great sky and sunset colors helped complete the package. Let me know in the comments when ordering whether you want the falls or canyons.
The Palouse River, which was responsible for Palouse Falls, was the geological legacy of repeated glacial dams and floods (especially the Great Missoula Flood) from the Ice Age.
In fact, Palouse Falls was said to be the only year-round waterfall that resulted from this turbulent history, and it actually resulted from a cataclysmic backup of the Palouse River that caused its watercourse to be re-routed!
The accompanying canyons and hills surrounding both the falls and the deep gorge here provided clues to violence of the geological forces at work from that last major Ice Age.