Located in Jeju Island, this awe inspiring lave tube is 7 km long but only 1 km can be accessed by the public. The tube was created by lava streams running through it. The cave is lighted in way that makes the walk through the cave a more awesome experience.
There was bit of controversy on how it got voted as one of new 7 wonders of the world alongside the Underground River of the Philippines. As far as I am concerned, it deserves to be on the list! It is also a UNESCO World Heritage Site.
