Located beneath the city of Louisville, Kentucky under a number of roadways, this man-made cavern features 17 miles of corridors to soar through. Louisville’s Mega Cavern is the world’s only underground zip lining facility, so they’re flying above the competition. But, don’t think that title came easy. It took 12 years to obtain an underground permit to house this zip line facility.

In addition to the zip line, you can buff up on your history, geology, mining, recycling and more at the Mega Cavern. I don’t know about you, but I’ll be checking this out ASAP.

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