The Quinta Bella oratory was designed in 1864 by the architect Manuel Aldunate and was officially inaugurated by the Catholic Church in 1865.

The building a mixture of several styles such as neo-classic, byzantine and baroque, the oratory has an octagonal floor plan (the only one in Chile), the entrance is framed by two octagonal high and slender domes that are formed by columns that end in Roman arches and culminating with an octagonal wooden point with a triangular arch base. The door was carved in wood, but due to its deterioration, it was replaced by some plywood panels.

The octagonal dome grants brightness to the space, it has geometric stained glass windows, but most of it, does not have any windows at all. It is richly ornamented inside, in its vertical the Scandinavian cross of Saint George can be highlighted and the upper part is crowed by a halo and with the “all seeing eye”. It is also evident that, the pigeons come in and out, that the oratory is their nest and that in many of the images you can see their eggs.

The oratory is made of stuccoed masonry and its towers were made of wood stuccoed with lime. Both columns are ornamented with plaster moldings, as well as friezes and cornices. Colors, such as light blue and gold can be appreciated in its interior. In the arches different motifs and symbols can be seen such as the faces of cherubs, and bunches of grapes representing communion, among others.

It is said that the oratory in old times was laid out in a Greek cross floor plan and that possibly, in 1873, the two towers were incorporated, as well as the renewal of the sacristy behind the altar and the second choir level.