The U.S. National Park system is arguably one of the greatest collections of preserved space the world has ever seen. From snow-capped glacial peaks to meandering coastal shorelines, some of the U.S.'s most awe-inspiring natural sights are found within the national parks. That said, utter the phrase "national park" and most people will only be able to cough up only a few of the usual suspects: Yellowstone, Yosemite, Grand Canyon. In 2010, the most visited national park in the United States was Great Smoky Mountains National Park with an astounding 9.4 million visitors.
While parks such as Yellowstone are undisputed highlights, this list should shed some light on lesser-known national parks worth the cost of admission.
-- Kyle Ellison