WATCH: Colorado boy tells David Muir about becoming youngest American to climb Matterhorn

After becoming the youngest person to climb El Capitan in Yosemite by rope, 11-year-old Sam Evermore is now also the youngest American to climb the Matterhorn in the Alps. David Muir shares his story.

​After becoming the youngest person to climb El Capitan in Yosemite by rope, 11-year-old Sam Evermore is now also the youngest American to climb the Matterhorn in the Alps. David Muir shares his story.   After becoming the youngest person to climb El Capitan in Yosemite by rope, 11-year-old Sam Evermore is now also the youngest American to climb the Matterhorn in the Alps. David Muir shares his story.