Personally, I think a mix of topix makes sense on here. History, specifically, an unexpected time capsule being one of them.
Very similar to the Gritty NY photos also from a couple of days ago --
What to Submit
On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.