What makes Kentuckiana unique? Is it the food? What about people or places? Each Thursday on WDRB News at 11 p.m., we'll take a look at the people, places and things that make Kentuckiana special in a weekly series, “Living Local.”

LOUISVILLE, Ky. (WDRB) -- Down by the Watterson, buried deep beneath the city, is reportedly the world's largest indoor bike park.

"Forty-seven different trails about 13 miles total worth of trails," said Jeremiah Heath, general manager of Mega Cavern.

Once a mining operation, Mega Cavern is a man-made cave where thousands of visitors come year round to explore Louisville's deep dark secrets, including 17 miles of roadway.

And Heath says that's just the beginning. There are six different tours, an aerial ropes tour, and historical and geological tours, all taking visitors through about 4 million square-feet of the cave.

One of the most popular attractions is the zip line tour.

"It's an all-underground zip line," Heath said. "Six different zip lines [and] two suspended bridges."

On one side, you have all the tours. But deep inside the cavern on the other side is a secret massive storage facility.

"We have the pods," Heath said. "We have two different document storage companies ... We also offer boat storage, car, RV ... different things like that."

Another fan favorite is Lights Under Louisville, the annual Christmas display.

Crews are busy putting the finishing touches on the more than 2 million points of lights.

"Every section of the cavern has a different theme," Heath said. "As you drive through with your windows down, you get to listen to the music."

Altogether, Mega Cavern delights the kid in all of us.

"It's pretty cool," Heath said. "You just have to come in, and you have to try it."

Light's Under Louisville starts Nov. 18 and runs through Dec. 31. Tickets are $30 per standard vehicle.

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