You’ll Ace This United States Geography Quiz If You’ve Visited All 50 States
The longest known cave system in the world is in the United States and is called…

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Mammoth Cave is the longest cave system not only in the United States but in the entire world. Located in Kentucky, Mammoth Cave stretches more than a whopping 420 miles.
Jeffrey Greenberg/Universal Images Group via Getty Images
Jeffrey Greenberg/Universal Images Group via Getty Images
The longest known cave system in the world is in the United States and is called…
- Mammoth Cave
- Luray Caverns
- Wind Cave
- Meramec Caverns
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