Puzzle 101 - Photos
Pretty much since the dawn of digital photos, photos have contained hidden information called Exchangeable Info File, aka exif.
This info contains quite a lot of information about your photo. Things such as shutter speed, exposure compensation, ISO, original resolution, if a flash was used, etc. are recorded in this hidden info.
There are a number of online tools that will show you the exif information of an image. They shouldn't be too hard to find. PLEASE DO NOT DOWNLOAD anything to solve this cache. I've just heard of someone getting a virus after a download from some site they found. Since I can't link to the actual EXIF viewer I use, here is a link to some Google Results. Google Online Exif Viewers Thanks Jeffrey for the tip!
NEW!!! Here is a video I made showing how I solve this. Click here to view.
However, sometimes, the CO will try to confuse you by making the photo appear to be something different then a photo; kind of like this puzzle ;-)
The Puzzle
The cache can be found using the photo below :)



