Much of the diverse landscapes of the United States is showcased in our national parks. They act to preserve the natural beauty that this country has to offer while also providing an outlet for travelers to appreciate it. Of the 59 established parks, these 15 showcase the best of America's environmental abundance.
15. Mammoth Cave National Park
The longest cave system on earth was sure to find a place on this list. Located in the heart of Kentucky, Mammoth Cave National Park’s over 400 miles of underground tunnels contain cave shrimp, salamanders, and at least eight different species of bats. The park also boasts over 70 miles of aboveground trails surrounding the Green River.