You might be interested in these https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_mathematics https://en.wikipedia.org/wiki/List_of_unsolved_problems_

You might be interested in these https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_mathematics https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_m... Notably some of them like the Millennium Prize offer a reward of 1M dollars if you solve it. There's definitely still some absolute mysteries out there!