Deep beneath Louisville, Kentucky, a vast underground world stretches beneath roads, businesses and even parts of the Louisville Zoo. What looks from above like an ordinary part of the city is, below ground, a man-made labyrinth created by decades of limestone mining. Today, the Louisville Mega Cavern has been transformed into an unusual destination where visitors can zip through darkness, tackle an aerial ropes course and travel through passages that once echoed with the sound of mining machinery.
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