Meramec Caverns is a large limestone cave located in Missouri, known for its stunning rock formations and underground rivers. It was formed over millions of years through the erosion of limestone by water. The caverns are a popular tourist destination, offering guided tours that showcase unique features like stalactites, stalagmites, and large chambers. The site has historical significance as well, having been used as a hideout by the infamous outlaw Jesse James in the 1800s. Today, visitors can explore the caverns, learn about their geology, and enjoy various outdoor activities in the surrounding area, including hiking and camping.