[Answer] Which U.S. state is home to the longest known cave system in the world?

Step 1 : Introduction to the question "Which U.S. state is home to the longest known cave system in the world?"

...1. Kentucky 2. Pennsylvania 3. West Virginia 4. South Dakota

Step 2 : Answer to the question "Which U.S. state is home to the longest known cave system in the world?"

Kentucky - Mammoth Cave is, well, mammoth! Located under dense forest and winding rivers near Brownsville, Kentucky, you’ll find the world's longest known cave system. Native American explorers are first believed to have ventured inside the cave roughly 5,000 years ago, but it wasn't until 1941 that the area became an official U.S. national park. The park is composed of two levels: the scenic valleys, bluffs, and forest above; and the namesake cave below. To date, 412 miles of the massive cave system have been surveyed, but more passageways and chambers are being discovered by explorers each year. The park comprises more than 50,000 acres of Kentucky land. On your visit, you can take part in horseback riding, canoeing, kayaking, or ranger-led cave tours.:

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