Abstract gnarly tree roots and trunk of ancient redwood trees, Muir Woods, Cali

muir woods redwood trees roots trunk abstract gnarly ancient cali national monument redwoods mill valley california trail oldgrowth marin county sequoia sempervirens old growth forest redwood trees nature forestry usa canopy towering muir woods national monument oldgrowth redwood coastal redwood ecology nature preserve golden gate national recreation area forested national park timber forested park pacific coast john muir mount tamalpais forest park outdoors us united states serenity green verdant greenery environment tranquil sounds of nature