When Annabel Crabb was a primary school student her uncle worked at the Adelaide Zoo and during the school holidays he used to take her behind the scenes.

Crabb recalls her delight and wonder at being able to see all sorts of things the ordinary visitor would not be able to see and says she got a similar thrill making her new documentary series, The House, which takes people around, inside and even beneath Parliament House.

"There's no other building like it," says Crabb of Parliament House.

"It was like a real treat getting to wander around and having someone to answer all my questions," she says.

"Everything about the building is thought out. One of the things that stuns me is the extent to which the original design team still has a say in what goes on. You can't just knock out a wall and add on a pergola. Every change has to be talked through with the members of the design team who are the moral rights holders. There's no other building like it in Australia.".