I've been surprised how inactive and, well, dull the Unexplained Mysteries and Paranormal forum seems to be.
Here is a really excellent site that has been around for MANY years and is owned and operated by folks known to me who are SERIOUS about Unexplained Mysteries and Paranormal phenomena:
https://www.anomalist.com/
It is updated daily with brief commentary and links to news of the weird from around the world. They also keep abreast of new books and show them down the right side with links to Amazon.
I've visited this site daily for at least 20 years. If you have any real interest in these topics, you owe it to yourself to make this one of your go-to sites.