elsslots
I am really impressed by the collective effort and by how precisely you have channeled all of this feedback. Beyond the people who actively expand the content of the website, I think much of the community's strength also comes from the extensive feedback provided by its members. This is a great example of that.

I have another suggestion. Sometimes, while browsing the website, we notice minor errors that are too small to justify opening a separate forum thread, or even sending a message or email about them. Perhaps we could have a permanent forum topic called "Minor Website Errors", where anyone could quickly report small issues they come across.

For example, just today I noticed that the official UNESCO page for Metz had not been added to the website. I also found that the link to Marc Rousere's review, "Vézelay in 2023," was broken. These are very minor issues individually, but given the extensive feedback and collective attention of the community, why not use that strength to identify and quickly fix these small errors as well?

I think it is a good idea csarica. So here it is.

Don't post technical issues here - they belong at the Technical Backlog, so nfmungard can pick them up.
And for location data, when you find incorrect coordinates, we already have TWHS Maps - The Data & WHS Map - The Data

But the examples you gave, such as missing or expired links, I can fix myself, as well as changes in names, titles etc.

Your first two suggestions have been fixed...
The root cause of each of these 2 minor issues also causes "problems" in similar situations.
I will do a broader search on which twhs have missing UNESCO links and where links to reviews with a diacritical sign in their title/slug cause the same issues. So I can fix them for all and/or put in a request for a permanent solution on our technical backlog.