Sierra Nevada bighorn sheep are animals worth seeing. With their bright white rumps and the rams' remarkable headgear, they bound and leap over seemingly impassable alpine terrain. But you may have a tricky time spotting one–there are only about four hundred in existence.
These gigantic, zoomable photographs bring all the glory of great places to your screen. They also bring you geologic lessons of all sizes.
Air pollution may seem like an urban problem, but it’s becoming an increasing concern in California’s national parks.