Boone and his contemporary, an African American, Monk Estill, are the first on record to have made gunpowder in Kentucky.

This book was quite famous at the time and the setting for Cudjos is approximately the same as Gap Cave.

[2] In March 1920 Lincoln Memorial University bought the caverns and surrounding land from private owners.,[4] and in 1934 the Gap cave was re-opened to the public.

Gap Cave had been vandalized, broken light bulbs were around every corner, graffiti was on nearly every wall, and the stairs and bridges were very unstable.

The restoration was completed in the late 1990s to the early 2000s; the cave is nearly back to its original condition and tours now run off lantern light instead of electricity.