Mammoth Cave, located in Kentucky, is the world's longest cave system and a UNESCO World Heritage Site.

Mammoth Cave, located in Mammoth Cave National Park in Kentucky, is the longest-known cave system in the world, with over 420 miles of explored passages. This remarkable natural site is famous for its large chambers, detailed limestone formations, and diverse plant and animal life. It is recognized as a UNESCO World Heritage Site and an International Biosphere Reserve and has a rich history linked to Native American explorers and early settlers. Visitors can take guided tours to experience its breathtaking geological features and learn about its historical importance.