Hengill, Iceland - Hengill was formed from a Palagomite tuff, it is a central volcano and has a giant magma chamber beneath it. When thick basalt lava flows cool, they form hexagonal cracks, called columnar joints
are those who sit at home and wonder what it is beyond their front door. Than there are those that go out seeking the ends of the Earth looking behind many doors. It is imbedded in our DNA to try and discover what lies beyond our reach.
This natural limestone cave in China is over 180 million years old (though the colorful lighting is a bit more recent). Fun fact: Ink inscriptions on the cave walls have been dated all the way back to 792 AD, and tell us t