Chatsworth House, Derbyshire UK
Golden Bay in New Zealand or anywhere in New Zealand basicly is breathtaking and has many places you only can reach via helicopter or plane or balloon!!
Anywhere in Africa. It was so so beautiful when I did a tour there. I went with a few different companies some good others bad
Vermont in the Fall months (leaf peeper season!) The mountains are extremely bright and colorful and we have hot air balloon festivals here very often because of the beautiful landscape in and out of the fall season.
I am planning a trip in Bagan, Myanmar. It was the capitol of several ancient kingdoms and apparently the balloon gives an incredible view of the 5,000 11th century pagodas of Bagan!
I did a balloon safari over the Serengeti of Tanzania a few years ago and it was just amazing, the landscapes from this point of view are unique, you can really discover the country from another perspective 🙂
Cappadocia in Turkey seems incredible, it's known to be one of the best spots for balloon flights!