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.

(WAVE) - Seven million lights are used for the Christmas Displays in the Louisville Mega Cavern’s Lights Under Louisville attraction. WAVE Photojournalist Michael Flynn drives through the ...

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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