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Library of Congress The trunk of the famous Wawona tunnel tree in Upper Mariposa Grove, California, measured 26 feet in diameter. The tree (pictured here with a stagecoach) was a popular tourist ...

The tunnel tree that used to be the park entrance is located in Tuolumne Grove, which is one of just 75 groves of sequoia ...

A GSOB Blitz is a community-powered effort to detect and map goldspotted oak borer infestations. With your help, we’ll survey ...

Twenty-nine elms were planted Monday in St. Helena's elm tunnel, part of a long-term effort to restore the tunnel.

California’s giant redwood trees are some of the tallest and most ... How can a tree possibly grow so wide and remain healthy after having a tunnel carved through it? Let’s explore why these ...

In the 1930s, workers bored a 13-mile tunnel beneath Mt. San Jacinto. Here's a look inside the engineering feat that carries ...

The Tunnel Log, located along the Crescent Meadow Road in the Giant Forest, offers a fun photo-op for park visitors. This enormous tree, which fell across the road in 1937, was 275 feet tall and ...