World's Eyes: senseable.mit.edu/worldseyes/

When posting photos online, users of the photo sharing platform Flickr transmit to the world their perspective of a place or event through the lens of a digital camera. Each digital photo file codes both the time when that photo was taken and the location it captures. Analyzing this information allows us to follow the trail that each Flickr photographer travels through Spain. (Un)photographed Spain maps thousands of these public, digital footprints over one year. As photos overlap in certain locations, they expose the places that attract the photographer's gaze . In contrast, the absence of images in other locations reveal the unphotographed spaces of a more introverted Spain.

Density and flows of photographers
In 2007, the Iberian Penninsula clearly splits between Portugal and Spain with Barcelona constantly acting as main hub connecting people to Madrid, the Balearic Islands, Andalucia and the Cantabrian Sea in the North.