Fair point, yes best to keep it strict on these ones.

Ah yes they had dropped the restriction by my second visit in 2012.

It was a little obscure, but I was geekily pointing out that even when there was a restriction it could be circumvented, as I did when I took that picture in 2005, and which is amazingly still the main picture on wikipedia 17 years after I posted it :)

That's pretty amusing that you have the main picture on the Wikipedia page! No clock towers will be replaced on your watch! :-)

I like Els' nomination of the Rietveld-Schröder Huis. Unfortunately. I haven't visited recently enough to see the changes, though I very much enjoyed my visit when I went. Glad to see there aren't any more photo restrictions, and for me the fee seems fair.

I like to propose a new one: Fray Bentos

1. You show your OUV! - Wide open.
2. Thou shalt be ready to receive visitors after becoming a WHS - They seem to have embraced their WH status, the site looks well-managed from a visitor perspective and staff were very friendly.
3. You are clear about your core zone - good map, shows the fairly wide area inscribed (including the workers village).
4. You shall have a proper UNESCO plaque - It's at the brick wall at the entrance gate to the plant.
5. Thou shalt practice fair pricing - Very fair. You can wander around the grounds for free, visit the museum for 50 pesos or join a 1.5h tour of the plant for 150 pesos (3.5 EUR). No foreigner pricing.
6. You shall create and maintain an official website - It's here, with opening hours, tours etc
7. Thou shalt not unduly limit or charge fees for personal photography - Photography is allowed everywhere.
8. You shall spend some money on proper paper tickets - You get a ticket that is specific to the site.
9. Thou shall provide translations - This is the only point where they could improve, although they try their best. They do have an English speaking guide but he's not always on duty of course. He guided me for half an hour before the official tour started at 3pm and his shift ended. I then joined the Spanish tour. They could provide printed and plasticized translations of the texts spoken in English, but it does speak for itself mostly ("this is where the animals were killed", "this is where the vets tested the meat" etc).
10. Thou shalt not force visitors into packages or tours. - Independent visits are also possible and you can see quite a lot, but you cannot enter the plant buildings. For safety reasons I can understand that they do not open those up to all.

After visiting today, I would suggest Himeji. Fair price, plaque, paper ticket, boards in Japanese and English, maps and brochures in plenty of languages, clear map shown on site, no tours, wide open, well managed, easy to visit, pictures allowed everywhere, no drones.

I think it is a good one, FredericM. I will add it