This strenuous 16-mile trek weaves past golden meadows to the crumbling crown of Broken Top, a glacier-scraped volcano in Three Sisters Wilderness.

Save a weekend for this 27.4-mile loop in the Cascades that climbs an extinct shield volcano and tours lake-dotted landscapes in the Diamond Peak Wilderness.

Link lake-dotted landscapes, Cascade views, and waterfront campsites on this two-day, 28 miler that climbs an extinct shield volcano in the Diamond Peak Wilderness.

This two-day, 26.5-mile loop in the Cascades climbs an extinct shield volcano and tours lake-dotted landscapes in Diamond Peak Wilderness.

This volcano has lured explorers for decades. Good reason too: The 8.8-miler mixes trails, routefinding, and hand-over-hand scrambling.

This 10.6-mile out-and-back in the Cascade Range negotiates a variety of climbing routes to a crumbling volcanic summit (and a dizzying view).

Link pumice and obsidian fields with expansive alpine meadows on this challenging trek to the top of South Sister, a glacier-capped volcano in the Cascade Range.

This challenging, 12.2-mile trek ascends the spiny, volcanic ridge of Three Fingered Jack for dizzying views across the Cascade Mountains.

Travel into the fiery past of Mount Mazama on this 5.2-mile out-and-back to the park's highest peak, where sprawling views of the deepest lake in the United States await.

ELK LAKE to OR 252: Skirt the glacier-draped Three Sisters on this 26.6-mile trip full of excellent ridgetop campsites, aspen-lined lakes, and fields of black volcanic glass. Tip: Wear durable boots.