Book excerpt: An extraordinary illustrated overview of the National Marine Sanctuary System and a guide to its fourteen protected underwater locations America's Marine Sanctuaries tells the story of fourteen underwater places so important they are under special protection, together forming the US National Marine Sanctuary System. These sanctuaries, spanning more than 620,000 square miles and ranging from the Florida Keys to the Great Lakes and to the Hawaiian Islands, are critical and breathtaking marine habitats that provide homes to endangered and threatened species. They also preserve America's rich maritime heritage and act as living laboratories for science, research, education, and conservation, offering outdoor recreation experiences for all ages. Through 175 full-color photographs and lively narrative, America's Marine Sanctuaries showcases each of the marine sanctuaries and the creatures that live there, from whales and manatees to Hawaiian monk seals and Laysan ducks, as well as sunken ships from the Ghost Fleet and USS Monitor to Shipwreck Alley. The book underscores how marine sanctuaries have shaped the nation's development, survival, and identity, and celebrates these protected underwater treasures for all they can tell us about our communities, our country, and our world.