In Australia we have underground houses at Coober Pedy, White Cliffs and Burra. But the largest of them all is in Canberra the national capital and I might add the largest underground house in the world. The photo above shows the building from the north with the old parliament house in front. It also has the largest flagpole in the southern hemisphere which is made from stainless steel.Note the earth berms to the right and left of the photo.
It is bigger than Bill gates house.If I am wrong please let me know in the comments section.
This image is close to the front of the building which cost over a billion dollars
This image is further away and the reflection pool is behind the posts