<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/16715795/w%3D160_h%3D160_s%3D1/7231f409392eaad7e4d88cdad1f47dd0>
<https://marketplace.500px.com/photos/16715795/hilton-head-island-by-bill-schuchman>