My recent self initiated project was about geographical ignorance, in particular my own. After drawing the world map from memory and probably being able to name about 20 countries I gave myself 2 days of intense revision and then redrew the world map from memory.
Here is a photo of my original map drawn on Monday the 7th of February -
And my final map drawn on Thursday the 10th of February-
As part of my research I asked a few people to draw the world map on the spot, here are a few examples -