I would have Syria on my list too. The driver we had in Jordan (a country that blew us away with everything to see and do, and how friendly everyone way) always said that Damascus was even better, his favourite place. I have a list as long as your arm of other places too that are just not safe any more - Ethiopia, Myanmar, Sierra Leone, Venezuela.
I would say from speaking to colleagues that though China is open again there has been a marked shift post-Covid in how westerners are seen. I met a Chinese fellow competitor at an international sport event last year and he was not optimistic it would be a place he could invite us to compete in for some time. My colleagues were treated atrociously there during Covid, worse than you would treat a prisoner. It has made my colleagues wary of the place, and we used to have such fun on Beijing and Shanghai trips but not now.
Hong Kong has also got a different vibe now to a few years ago. Much more edgy, less welcoming.
As for San Fran, I got off the bus there once at the wrong stop and have never seen so many passed out drug addicts with needles hanging out of them. And it is apparently worse now than it was a few years back.
@Eranzer not many people know about the Richat Structure! I have seen it from the air. Fascinating thing, but I don’t think you would see much from the ground or even from a light aircraft. You really need to be at airliner height to get the best view, and the weather conditions often make it hazy so when you can see it it makes it even more special!