Wikipedias List of Unusual Articles contains some true gems. Good to check out every once in a while to get a giggle from some dumb shit someone did at some point. Also has an excellent picture of a cow with antlers ontop a electric pole, among other things. If an aritcle has some sort of check mark or star, that means that you have found a good one. My the best way to rummage through this web page is to first, pick a topic of interest on the table of contents and click on stuff that sounds interesting Some of my favourites
Some notable mentions not on the page above.
Some of my favourite pages on mathematics found here,