Mammoth Cave National Park is located in the state of Kentucky. Almost 2 million people visit the park each year! Mammoth Cave is the world's largest cave system. During the War of 1812, some of the materials inside this cave were actually used to make weapons! Many people like to hike, bike, and take a cave tour when they visit the park. It is home to many animals like snakes, salamanders, songbirds, and bats.