<http://schema.org/thumbnailUrl>
<https://drscdn.500px.org/photo/10228787/w%3D160_h%3D160_s%3D1/7da5ff26fc9c23d4af6b4322430307c9>
<https://marketplace.500px.com/photos/10228787/sri-lankan-train-ride-by-greg-goodman-adventuresofagoodman-com>