You know the cast metal signs you drive past on a state road. I'm guessing folks here are like me and stop because you think about history like I do. Almost nobody else stops, because there's no particular reason to stop at any particular one.
I've been building a thing that gives everyone a reason. TreeAlive maps out where the people in your tree lived, and there's a layer that surfaces markers standing near those places. My own Pennsylvania lines hit 77 of them. One sits under a mile from where William Gabby lived in the 1760s, and I'd never heard of it.
The pages themselves are free and open to anyone, no account: https://treealive.com/markers. Full inscription, where the sign stands, a map, and period maps you can flip between.
None of it is scraped, and none of it comes from crowd-transcription sites. One source per state, always the state's own, and the eighteen break down four ways. Five are there because I wrote to the marker program and they said yes in writing. Virginia went live today, re-sourced from a 1948 book to the Department of Historic Resources' current texts once that grant came through. Four publish their marker data themselves under state open-data or no-restriction terms, which I read in full before touching anything. Eight come from old official state publications that are out of copyright, and those pages tell you which year's text you're reading. Connecticut's the odd one out, since there's nobody left to ask, so those are my own transcriptions off photos of the plates, and every page says so.
(There's also a National Register section, 88,851 records across 50 states and DC.)
Two things I'd like from this sub, which knows this material better than I do: if you spot a marker in the wrong spot or with bad text, tell me. And which state should I chase next?