LLNL announces a new tsunami warning system using the world's fastest supercomputer, El Capitan, for real-time forecasts.

El Capitan is located in the western portion of the Yosemite Valley. After parking, most visitors use the Valleywide Shuttle to get to the El Capitan picnic area at stop No. 8.

The Yosemite Big Wall permit program now requires climbers to register on its most popular walls. Climber reactions are predictably mixed. Emily Harrington, a 34-year-old Yosmeite pro, becomes the ...

The El Capitan Theatre was buzzing as D23 fans got an exclusive first look at "Alien: Earth" during a special early screening ...

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.