Following up on the forum thread with the same name, I created a simple mod, placing monuments of all the lost settlements that disappeared some time before the events in Skyrim: Amber Guard, Amol, Bardmont, Blackmoor, Dragon Wood, Dunbarrow, Dunpar Wall, Dunstad Grove, Granitehall, Greenwall, Helarchen Creek, Karthwasten Hall, Korvanjund, Lainalten, Laintar Dale, Markarth Side, Neugrad Watch, Nimalten City, North Keep, Oakwood, Pargran Village, Reich Corigate, Snowhawk, Stonehills, Sunguar