Welcome to Muir Woods National Monument, a sanctuary of ancient coastal redwoods located just twelve miles north of the Golden Gate Bridge in Marin County, California. As you stand at the entrance, you might notice a sudden drop in temperature and the presence of a cool, damp marine layer. This fog is the lifeblood of the forest, providing the moisture these giants need to survive the dry summer months. You are entering one of the last remaining old-growth coastal redwood forests in the San Francisco Bay Area, protecting over five hundred and fifty acres of a landscape that once dominated the California coastline. Prepare to leave the chatter of the modern world behind as you step onto the boardwalks. Here, the scale of time is measured not in minutes, but in centuries. Look up and take a deep breath of the oxygen-rich air, filtered by a canopy that sits hundreds of feet above the forest floor.