Take a picture of a picture from the past in the present.
The site is a mix of funny ("Any idea where them dinosaur shorts are at?") and poignant ("Dad never took a picture of me, ever. Then I noticed his reflection in the glass"), with a lot of memories mixed in.
It reminds me of a photo of myself, taken at a local park when I was around 2 or 3. When my cousin was born 14 years later, he looked so much like me at that age that my mother took him to the same park and photographed him on the same rock. When my eldest was the same age, we did the same thing. The 7 year old got the same photo, and this fall, the intern will have her turn to sit on the rock. It's pretty cool to look at all of these photos and see the park's changes through the years (much like Dear Photograph).