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.

You need to find three specific firework locations on Firework Isles to open the Gloomy Cavern gate as part of 'The Wonderful Journey' Exclusive Quest in Infinity Nikki. Although you are provided ...