Monday marks 108 years since the Grand Canyon was declared a National Monument. It's "the one great sight which every American should see," according to Theodore Roosevelt. As the only of the Seven ...

Deep beneath the Antarctic seas lies a hidden network of 332 colossal submarine canyons, some plunging over 4,000 meters, revealed in unprecedented detail by new high-resolution mapping. These ...

I feel as though I’ve just passed through a magical portal. One moment, I’m walking across a gravel parking lot for San Diego’s Los Peñasquitos Canyon Preserve, accompanied by the hum of traffic from ...