Also, deep web/darknet stuff.
If you know how to access various sites, you're guaranteed to see terrible things which I don't even feel comfortable mentioning.
When I first learned about these places, I did some investigating out of curiosity. Needless to say I'll never go near that # again. It's best to
just stay away.
However, I have also seen horrible things on the "normal internet". Here is something to get you started, should you be interested.
There is or at least used to be a video of them torturing a man to death available on the internet. It's very graphic.