Using the following script that targets the URI of a picture of the day (say http://lanlsource.lanl.gov/pics/picoftheday.png)
with incrementing datetime values for HTTP content negotiation and "follow your nose" HTTP navigation, all pictures of the day were gathered.
In essence, the URI is asked about its past, and the URI gracefully responds by pointing at a TimeGate
that knows about its past,
and redirects to archived images that match the requested datetime values.