The Mighty Northwest: Home to the tallest trees on earth, the last of America's big glaciers, and a string of towering volcanoes, America's Pacific Northwest is one of the nation's most intriguing and mesmerizing natural wonders. In this five-part series, discover the epic meeting of land and sea that attracts some of the biggest marine life on the planet, traverse the Redwood forest—home to an incredible diversity of animals and the tallest living beings on earth, and trek the iconic Rocky Mountains where wildlife thrives despite the harsh climate and steep elevation.