In the Orsay Museum you can find a cut away of a model of the Garnier Opera House and then underneath a glass floor a model of the whole area around it.

The cut away of the opera house showing all of the incredible detail that Garnier designed and built.

The opera house under the glass floor.

A view of the opera house and the neighborhood around it. Can you see the road leading up to it? It is the only street in Paris that doesn’t have trees on it so that the view of the Garnier Opera House won’t be obstructed.