The picture below is called a "Stereogram". I have never been able to see the image hidden in these pictures. I guess you need to relax your eyes, some people cross their eyes, and then Boom!... magically you see an image of a castle or pirate ship.
Hidden in the images are the coordinates to the cache!
Once you solve the puzzle, you are looking for a pint sized container with a screw top lid, I promise it was never used for it's intended purpose. Bring your own pen.
If you are like me and have never been able to see the hidden image, there are ways to descramble the stereogram to see the hidden text. Based on feedback from the FTF team, viewing on computer screen seems to work better than viewing on phone.
