I have been wrecking my brain on that school puzzle with the png picture for days and I wont be able to find the cache because I am much too far away, however I want to solve this puzzle!
I have tried everything I could think of, every stego program, tried to extract meta data, layered both the PNG and JPG on top of each other to look for differences but nothing! The evil thing I cannot try to see if the image is mirrored and that the building has a mirrored view... Cant test this theory because there are no letterings in the picture!
If somebody has figured this one out and not willing to post it publicly, please PM me so I can get some sleep!
EDIT: speeling