In which US state is the Jewel Cave system?

peasypod

South Dakota. Feb 13 05, 5:31 PM

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What is the world's longest cave system? I saw this on a documentary a couple years back and can't recall the name. It is a fragile and fairly extensive underwater cave system off Australia. Anyone know the name? Why doesn't the US use the metric system? What US city is home of the first subway system?

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