<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/15420393/w%3D160_h%3D160_s%3D1/a06ce519eea0bcc9f1f9b55171cc6216>
<https://marketplace.500px.com/photos/15420393/excavator-sunset-in-blue-by-pino-stranieri>