I am one of few Swedish who like more the desert than high mountains like Atlas etc. Erg Chebbi is one of my favorite places, especially a little village Khamlia where it is still silent, not so many hotels, not so many tourists, really nice place. You can sit there only, talk with locals, look over the landscape, admiring the sunrise, or at sunset the whole landscape changes color from yellow to pink. Amazing it is.
Other favorite places is rain forest, contrast to the desert. And even if I have been on other continents so Africa is definitely my favorite one.
Morocco, Italy, Spain, West Africa