A number of large natural caverns pockmark northern Prince of Wales Island. The best-known of these, El Capitan Cave, has one of the deepest pits in the United States and is open to the public. Paleontologists have found a wealth of black bear, brown bear, and other mammal fossils in the cave, including some that date back more than 12,000 years. The Forest Service leads free two-hour El Capitan tours several times a week in the summer. Reservations are required, and no children under age seven are permitted. Rubber boots and a light jacket are a good idea for spelunkers.
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