What are the strangest novels you’ve read?

I loved the works of Lovecraft and Nikolai Gogol, both of whom share highly original universes despite being in completely different registers. Kourkov's novels also made a big impression on me, because of their modern yet absurd aspect.
So l was looking for other novels that also had stories, universes, writing styles and/or characters that were out of the ordinary.
What do you think are the most unusual and intriguing novels you've read?
Thanks in advance for your help!