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Many preservation advocates, from John Muir to Teddy Roosevelt, held discriminatory views that continue to affect equality in outdoor recreation.

The massive Golden Horn and Black Peak granite towers near Washington Pass tell a story 50 million years in the making.

Lewis and Clark were astounded by this 800-foot-tall basalt tower on their journey down the Columbia River, but didn’t know its fiery origin story.

Why are some salty and some freshwater? A giant ice sheet carved them 16,000 years ago, creating the hills, valleys and waterways that shape the city.

3,000 years of Ice Age activity shaped Pateros in Central Washington where the Methow River meets the Columbia.

The mountain’s namesake granite was used to build Seattle’s iconic Smith Tower and is coveted by climbers. But its peak is made of a much older rock.

North of Washington’s Gorge Amphitheatre are two massive lake-filled canyons, and geologists have chased clues about their origins for centuries.

The famous flower fields are connected to mudflows that spilled from Washington’s Glacier Peak less than 15,000 years ago. Could it erupt again?

About 15,000 years ago, Washington was covered by a massive sheet of ice. As it melted, it helped shape the state into the landscapes we know today.

Alison Mariella Désir and Knute Berger talk about the complex legacy of Catherine Montgomery, often called “the mother of the Pacific Crest Trail.”