The church has a basilical ground plan and five naves, the central one rising to a height of 45 m and the side ones to 29 m. The central nave and side naves are supported by a system of columns which is completely new in the history of architecture. In the eyes of the observer, the interior looks like a forest of trees with beautiful alignments, of which we can see the trunk, the branches and a cluster of leaves. In this forest of columns, the light filtered through the windows will give a bucolic appearance and give a feeling of undergrowth.