How cool is this? The world's longest sea caves found by geologist Nicolas Barth while he was exploring our very own New Zealand! The Otago coast in the South Island has six of the ten longest sea caves in the world. Another moment of awe for the natural wonders that this country holds. Wondering how easy they are to access, I wouldn't mind exploring through one! Matainaka Cave, Otago Coast, New Zealand!

Video from Youtube/National Geographic