<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/28900079/w%3D160_h%3D160_s%3D1/ff13d70a55534a22134f76fdfe62a996>
<https://marketplace.500px.com/photos/28900079/take-a-seat-tadashai-kawamata-by-julian-john>