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Sequoia National Park and King’s Canyon National Park, in mountainous central California, are remote bastions of snow-capped Sierra peaks, marble caverns, and glittering alpine lakes. Sequoiadendrum giganteum, or giant sequoias as they’re commonly called, are the largest trees on the planet, and these parks are among the best places in the world to see the skyscraper-sized wooly-barked marvels.