These majestic Coastal Redwoods were photographed in the in the Muir Woods National Monument in Marin County, California. Just north of San Francisco in Mill Valley, Muir Woods celebrated 100 years as a national monument in 2008. As the only old-growth redwood forest in the San Francisco Bay area, Muir Woods is actually one of few left on the planet. Once found throughout the northern hemisphere, Coastal Redwoods are now only only found in a narrow 500 mile coastal strip from southern Oregon to northern California. Coastal Redwoods are the tallest of all living things on earth with the tallest tree at Muir Woods measured at 258 feet tall. The average age of the Coastal Redwoods at Muir Woods is between 600 and 800 years old, and the oldest is estimated at 1200 years old. As old as this sounds, these incredible tress can live up to 2200 years old.