<http://schema.org/keywords>
"sky, people, street, travel, europe, tower, urban, architecture, road, scene, culture, life, asphalt, berlin, cloud, day, museum, editorial, clear, cities, place, famous, landmark, box, destinations, european, \u0002germany"^^<http://www.w3.org/2001/XMLSchema#string>
<https://marketplace.500px.com/photos/18218617/berlin-by-viktor-korostynski>