About 2,000 feet deeper than the Grand Canyon, Hells Canyon was rapidly carved when a lake spilled over about 2.1 million ...

The origin story of Hells Canyon, North America's deepest river gorge, has long been unclear to scientists. But new research estimates it formed about 2.1 million years ago when a dramatic flood ...

One of the highlights of our recent trip out west was visiting two national parks in one day – Bryce Canyon in Utah, which ...