Mammoth Cave National Park is a U.S National Park in the heart of Kentucky. Encompassing over 400 miles of surveyed passageways; it is considered the longest cave system in the world.
El Yunque National Rain Forest, is located 40 km southeast of San Juan in the Sierra de Luquillo. Formerly known as the Caribbean National Forest; El Yunque received its current name from the ancient Indian spirit Yunquiye (Forest of Clouds).
Located roughly two miles north of Fayetteville, Clark Park stretches along the boundaries of Cape Fear River. Clark Park is the second largest regional park dedicated to preserving the natural woodland area and educating the public on North Carolina wildlife.