Most of my favourite places have already been mentioned, but here are a few that I think have been missed.
Fountains Abbey, visited on a dreary March day, so next to nearly no other tourists.
Vergina in northern Greece, the tomb of Philip of Macedon, unrobbed and turned into an amazing display.
Petra, explored with a trainee guide , who was still amazingly enthusiastic, she also took us to Little Petra and out through the back of it to a place with lovely views where tourists rarely went... we took so long that a particularly gorgeous Jordanian soldier came to rescue us!
Baalbek in Lebanon, staying in the Palmyra Hotel, the site was amazing with views of the nearby Hezbollah communications tower, a weirdly bonkers place. The hotel was also run down and bonkers, but in a really nice way. Sadly, probably not safe to visit currently.
Luang Prabang in Laos was the most laid-back place I've ever been, tumbleweed down the Main Street at 8pm, I've never felt so chilled.