One day I asked Elder N. where he was from. He said Manila, Utah. I said where is that? He then proceeded to draw a map on my whiteboard.
Following that drawing, other missionaries came into my office to add where they were from. It's a nice history of whereabouts in my office, which I really appreciate.
Some of the missionaries have gone home, but the drawing is here to stay. Each new missionary that come into my office I ask them to sign my map.