para wrote:
People, take a look at the screenshot at http://tools.wikimedia.de/~para/GeoCommons/GeoCommons.jpg to see what's available right now.
With such an interface you can easily choose the photos where the camera was pointing towards the object you're interested of, and additionally choose which side of the object to see without knowing anything else
I think you should start with the center point, the Tower, select all nearby photos where the lens points in its general direction, enumerate these photos in a counter-clockwise direction, and display thumbnails of the photos:
Tower ^ | <---D A--> B C | V
Here, photo B is not selected because the lens points away from the target. But A, C and D are included in that order, CCW as seen from the target. Thumbnails are presented almost like a panorama:
+--------+ +--------+ +--------+ | A | | C | | D | +--------+ +--------+ +--------+