Tree Circus founder Timmy Womick and his colleague, naturalist Grayson Keating, added nearly 1,000 children to the many ...

a 275-foot tall and 36-foot-wide giant sequoia – the largest tree on earth by volume. Just south of Sequoia, visitors can hike the deepest canyons in the United States and witness the graceful peaks ...

EDMONDS—Not long ago, cutting a tree down in Edmonds could result in a forest’s worth of paperwork. But in December, the Snohomish County Superior Court ruled against the city’s “tree mandate,” which ...

This story appears in the December 2012 issue of National Geographic magazine. On a gentle slope above a trail junction in Sequoia National Park, about 7,000 feet above sea level in the southern ...