Not enough people know that this is a thing: one for the map people

You may or may not already be familiar with the Leventhal Map and Education Center (which resides at but is not part of the the Boston Public Library).

They have this Atlascope where they've uploaded maps of Massachusetts and then--here's the fun part--they LAYER then, so you can find places over time!

They recently updated Worcester with a 1911 one, which joins the 1886 layer they already had, which I had to take a photo of part of Tatnuck Square:

 ...because that's Abby Kelley Foster owning the property after Stephen's death.