Re: "i want people to know where the house is located and for passerby's to notice, but i also like the idea of it being covered. if i wanted only three places where earth would not be covering the dome, how would you stop the dirt from going onto the places that are to be exposed?"
Keep in mind there are other reasons to bury a dome besides energy considerations. When we build we will be totally underground. We are aspiring survivalists. We want to be underground to be harder to find, to make it easier to protect ourselves from people or things outside, and a buried home is much safer in a nuclear "accident" or mishap if you've taken precautions with air filtration etc. Some may disagree but I believe we are living in the end times. Things will get much uglier and more dangerous in the next decade. There may come a time you don't want someone to be able to instantly see your home. Consider that. If you do though, a simple fence or landmark can identify your property.
As for keeping the dirt on three sides in place, any garden retaining wall can do that. That's simple.
Here is one example of an underground dome....http://www.monolithic.com/gallery/homes/young/
I agree with the others who said a window underground would be against code and impractical. You can get bulletproof glass, skylights, doors. You can get radiation proof, flood proof or blash proof doors. It all depends on how much you want to spend.