Flickr is possibly the largest collection of public photos on the planet. Flickr has an API which allows anyone with some programming skills to write their own programs and websites, etc using their images and data.
Yesterday I came across the http://taggalaxy.de/ which allows you to view Flickr as a solar system. You search for an image tag and this becomes the centre of your solar system, and the most popular associated tags are the surrounding planets.
It’s another different way of exploring this vast collection!