I imagine Scapa Flow is possibly one of the most interesting places to dive around the UK, thanks to Gunther Prien and his crew.
I've spent about six months in the Dhofur region of Oman, both in the Empty Quarter (sand and rocks), and south of the jebel in and around Salalah (a couple of months of lush greenery then sand and rocks, plus ocean. It was mostly work but I'd love to actually spend a significant amount of time trekking on the jebel, can't see the wife going for it though.
I've spent about six months in the Dhofur region of Oman, both in the Empty Quarter (sand and rocks), and south of the jebel in and around Salalah (a couple of months of lush greenery then sand and rocks, plus ocean. It was mostly work but I'd love to actually spend a significant amount of time trekking on the jebel, can't see the wife going for it though.

