One of the fun things you can do is using the set of places API methods.

flickr.places.findByLatLon returns a placesId based on a supplied lat/long of somewhere you might be interested in.

You can then use that placeId to get photos around that location with a call to flickr.places.getChildrenWithPhotosPublic

Even more amusing is that you can get the actual shape co-ordinates for that place (for example the shape values or the polyline values of your local suburb or city).

I can tell you that I didn't expect to be able to access the shapefiles, bounding boxes and polylines for essentially every suburb I needed for a location based app I was building 10 years ago from a photo app API.