Flickr Places “is a method of exploring Flickr with geo-specific pages. The page shows the most interesting photos for a location (iconic photos they call them), the most recent and common tags for the photos and the most prolific photo groups. It creates a separate page for each geographic location with a unique human-readable URL. Places go down to the city level so San Francisco, Seattle, and London will each have their own page and unique URL. In time they will go deeper. Places will be accessible via the Flickr API.” More here and here.
From this project, data useful for evaluation could come out !