I recently gained permission at an old school that started around the early 1900's. I was really excited to get to go even though the heat was in the high 90's low 100's. I got to the spot and took some pics and tried to envision what it looked like over a century ago.
When going to a new town and I really don't have to time to research specific sites, I will sometimes drive to the older parts of the town and look for specific things that I know can have the potential to hold old targets. Brick sidewalks or where they were is a good spot to check.