I'm a huge geography and demographics nerd.
I updated a quiz I wrote 10 years ago on Sporcle. Name all the cities in Iowa over 8,000 in population.
https://www.sporcle.com/games/mjones34/Iowa8000
Fun quiz. I got 35/47, but I paused a couple of times (I didn't cheat & look up anything, but it gave me more time to think). Most of the ones I missed I probably wouldn't have guessed even with more time.