Acadia National Park - America's Crown Jewels! Acadia became the first national park established east of the Mississippi. Rugged coastline, granite peaks, historic hiking trails, myriad plant and animal species and Cadillac Mountain, the tallest mountain on the United States’ North Atlantic Coast at 1,532 feet, all help to bring two million visitors to the park each year. Explore these images of a Acadia and see her beautiful nature!