Book excerpt: "America's best idea" ~ our National Park units! As of 2016, the United States National Park Service oversees 410 park units. They are found in all 50 states, including Washington, D.C., and in the U.S. territories of Guam, the Northern Mariana Islands, American Samoa, the U.S. Virgin Islands and Puerto Rico. Listed by state and territory, this book gives you a glance at these amazing National Parks, including the disbanded and proposed units. Whether it is in the mountains, the deserts, the prairies, on waterways or in urban areas, America’s National Park units are unique and different from one another. Each unit is a jewel amid the national treasure and they all have a story to tell, if you have the time to listen.