Stereograms and 3-D images (no glasses required!)
Now, these pictures have a 3d object embeddedin them. it takes awhile to see, and takes practice. for all of the pictures except for the frog, the easiest way to see them is to put your nose to the screen, and VERY slowly move your head back. do not focus your eyes, let the image come in to focus. it will take a few tries.(at least, it did for me) for the frog, go cross eyed until you see one image in the middle, and focus on that one.
egypt- a couple of pyramids and a sphinx
the statue of liberty her head and body