<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/15341609/w%3D160_h%3D160_s%3D1/2fc7dfd6d7502e02b95ba75839f07928>
<https://marketplace.500px.com/photos/15341609/young-street-bridge-and-inverness-castle-scotland-by-stanton-champion>