Q-Files is a new-to-me free online illustrated encyclopedia with very accessible text and images.
It seems quite extensive.
I primarily use these kinds of sites in my ELL Geography classes when students are doing research on countries and/or states. Q-Files information on countries would be very useful, which I why I’m adding it to The Best Reference Websites For English Language Learners, under “World Facts.”
Unfortunately, it doesn’t have much info about states.
Thanks to Topmarks for the tip.