I've been looking at the 1900-1940 US census enumeration district maps that were recently released on FamilySearch. When I located the maps for where I grew up I realized that the maps would be great way to start a conversation. For the rural area where I grew up, I was trying to think who lived in what house. The only problem for me was that my memory doesn't go back to 1940.
But printing out a map for where your relative grew up or lives could be a great way to jog their memory.