<http://schema.org/image>
<https://drscdn.500px.org/photo/18462935/w%3D600_s%3D1/40125cdd3e159f6e53a885355a2bf3e3>
<https://marketplace.500px.com/photos/18462935/grenoble-in-a-sleeping-bag-by-julien-jasseny>