We usually shoot our Earth in its various forms and fashions from the ground. Those happier of us get up in the air and photograph from there. But there's an incredible beauty below its surface, too. In Slovakia, we're lucky to have as many as 2,400 caves (wikipedia) of which about 400 have been explored. One tenth of them is open for public. I rather believe that these are the most picturesque and fascinating. Because five are included in UNESCO World Heritage. :-)