Rotunda, Mammoth Cave, Kentucky

One of the world's greatest natural wonders, Mammoth Cave has five levels covering an area 10 miles in circumference. The Rotunda is a huge natural hall where visitors can still see the saltpeter vats used in the War of 1812.
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( Chris Walker, Chicago Tribune )

One of the world's greatest natural wonders, Mammoth Cave has five levels covering an area 10 miles in circumference. The Rotunda is a huge natural hall where visitors can still see the saltpeter vats used in the War of 1812.

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