The History Blog is a small gem because it is serious and not sensational. Always with a good level of detail for the average interested visitor, and from the original (or close by) sources. Plus pictures.
As well as Atom, though there's no <link> for it in the HTML:
* https://www.thehistoryblog.com/feed/atom
* https://validator.w3.org/feed/check.cgi?url=https%3A%2F%2Fww...
Applies to most of them.