Humboldt Redwoods spans 53,000 acres, an area almost twice the size of San Francisco. About one third, or 17,000 acres, of the park is old-growth redwood forest—the largest expanse of ancient redwoods left on the planet. This park offers one of the best places to see redwoods by car in the entire North Coast region: the 32-mile-long Avenue of the Giants.

Photo from The Big Trees and Founders Grove.