We've all driven past them. Those roadside signs that say "such and such happened here". Whenever I see one I try to pull over to read it. There's something about being near a spot where a famous event happened, or a famous person from history happened to be, that I really enjoy. It turns out that there is a website for people who "collect" historic markers: The Historic Marker Database http://www.hmdb.org/. It has a listing of markers, with pictures, that folks have sent in from across the US and Canada. It's organized by topic (Civil War, War of 1812, churches, railroads, etc) as well as location. It includes highway markers, markers from national and state parks and inscriptions on buildings. It's a pretty interesting site. Here are some of the ones I've seen.