There are a few near the U off Fir Hill (Hower house and another that I can't recall the name), one near Towell Cadillac (Edison was married there), west of downtown are Stan Hywet, the Carriage house (where AA was founded), the Simon Perkins mansion, the O'Neils mansion, the John Brown home, downtown is the Howe House (being moved for the new apartments at Main and Exchange)... and there's probably more but that's a quick list that I could come up with.