<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/12228953/w%3D160_h%3D160_s%3D1/795e4d5696e94a88f20ccfea77437e12>
<https://marketplace.500px.com/photos/12228953/sri-lanka-adams-peak-by-birgit-korber>