<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/23088075/w%3D160_h%3D160_s%3D1/4f45071946d8d5851f68fce2b43229e8>
<https://marketplace.500px.com/photos/23088075/alone-time-by-brent-burzycki>