Trees are the oldest and some of the largest living organisms on earth. While redwoods and sequoias get the most attention for their enormous sizes, there are many more "big trees." In this episode, we search out some of the champion trees listed on the California Big Tree Registry. From San Luis Obispo where the Registry is housed, all the way to Los Angeles where, with the help of a big tree hunter, we climb a giant floss silk tree to measure and crown it as a new champion. We visit San Simeon where William Randolph Hearst honored enormous ancient native oaks by building his castle around them, never cutting down a single tree. And we see native and exotic champion trees, and learn why it's important to recognize and sustain these giants among us.