<http://schema.org/about>
"Both experts and enthusiasts have provided theories about these mysterious structures, nothing can satisfy the question: \u201CWhy is this here?\u201D"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/lifestyle/eco-tourism/photos/8-amazing-structures-with-mysterious-origins/nan-madol>