As its name suggests, Kaua'i's Fern Grotto is a natural lava rock grotto covered in hanging ferns and tropical foliage. This special place was once the birthplace of the island's ali'i ...

But little did I know that just below me was an entire natural cave system waiting ... The wet limestone cave has incredible rock formations, waterfalls, and plenty of history to tell as expert ...

These include the smaller, warmer and more exposed Green Grotto on the south side of the island and the famous Faraglioni. A stunning natural rock formation that juts dramatically out of the sea ...