<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/24918259/w%3D160_h%3D160_s%3D1/d372836ca3abb48d01a16ea42507190f>
<https://marketplace.500px.com/photos/24918259/lenz-tiefencastel-by-miro-susta>