Top 10 Things You Didn't Know About National Parks

Some Big Trees
They're world famous. The redwoods at the Redwood National and State Parks — in Oregon and on the north coast of California — are the tallest trees on the planet. Many of them stand more than 30 stories high. Up until 2006, the 370-ft. Stratosphere Giant held the title for tallest tree on Earth, but three others — the Hyperion (378.1 ft.), Helios (376.3 ft.) and Icarus (371.2 ft.) — superseded it when they were discovered in Eureka, Calif.

• Ken Burns, American Filmmaker