Wimmelbilder is a genre of pictures filled to the brim with people, animals, vehicles, monsters and all kinds of stuff!

If it's a drawn picture with more things in it than you can count - it's most likely a wimmelbild.

It comes from a German word "Wimmelbilderbuch" (translated as "teeming picture book") - it's the name of a genre of all the super detailed picture books like "Where's Waldo".

Make yourself nice and cozy, crank that zoom-in to the max, and enjoy!

Description taken directly from https://www.reddit.com/r/wimmelbilder/