One of the city's more unique attractions, the 100-acre Louisville Mega Cavern, which was created out of a 19th-century limestone quarry, now houses the world's only underground zip line course.

When Floyd Collins ventured into Sand Cave in Kentucky on Jan. 30, 1925, he was searching for the next big attraction. But he ...

The umbrella leaks at places called sinkholes, from which surface water makes its way underground, eroding the limestone into a honeycomb of caverns. Mammoth, the world's longest known cave system ...

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