Yellowstone National Park sprawls over an astonishing 2.2 million acres of wild landscape.
Yosemite National Park is recognized for its grand waterfalls, towering sequoia trees, deep valleys and vast wilderness area.
Cahokia Mounds State Historic Site is home to a prehistoric Native American city near Collinsville, Illinois.
Mammoth Cave National Park is home to the world's longest known cave system.
Mesa Verde National Park covers 52,485 acres near Montezuma County.
The Redwood National and State Parks (RNSP) are a complex trio of federally and state-managed parks that protect 45% of all remaining coast redwood old-growth forests.
Carlsbad Caverns National Park is an American national park located in the Guadalupe Mountains in southeastern New Mexico.
The Great Smoky Mountains National Park is a vast area of pristine wilderness, spanning more than half a million acres.
The Grand Canyon National Park is best known for its visually overwhelming size and intricate and colorful landscape.
Liberty Island is home to the Statue of Liberty.