One of the best amusement parks in the U.S., Silver Dollar City is a unique theme park that combines both thrilling rides and entertainment, as it embraces a down-home, late 19th-century vibe.

But little did I know that just below me was an entire natural cave waiting to explore.  Marvel Cave at Silver Dollar City ...

This giant natural cave is right below one of America's favorite theme parks (and yes, you’re allowed to explore it).