This thread keeps on being extremely inspiring! 
After reading about the initial ideas here about miniature memory palaces I tried memorizing all the 75 wild mammal species of Sweden using a horse as the memory palace. I think I never made a journey so quickly before. And it seems to stick very well. Also it feels nice to have it all gathered “in one place”.
Yesterday I tried to take it a step further, putting all 45 presidents of the US on one apple. That also worked flawlessly and felt really cool! 