Brit and his wife purchased the farm in 1980. They put a modular home on the top of the hill to live in while they built the house. The idea of an underground house often conjures images of a basement like dwelling. Not so here! The house is constructed of 6 concrete arches in a row. So the ceiling in each room is a lovely 13 ft. high arch. At the apex of each arch, on the exposed side, are custom designed, stained glass windows. You enter the house at ground level where only the garage and top of the atrium are visible above ground. Then take the stairs down into the house proper. The opposite side of the house is open to the sun and is at ground level.
The construction blah blah blah. the top of the house plastic styrofoam. the cold from the winter travels through the soil to reach the house in August. The warmed soil from the summer sun reaches the house in January. The roof over the garage and atrium would be a great place for solar panels.
We have used the roof for our vegetable gardens. We used most of it for a while, but lately have just had one small raised bed.