Inwardly the mausoleum appears as a large, high chamber with deep niches at the sides and diverse decoration. The interior of the mausoleum has a square plan enlarged with four niches that created a cross-shaped space. One can see that the internal dome is neither by the form nor by the height corresponds to the dome from outside. Reason for this is that between inner ceiling and outer cupola is the hollow space.
The interior is lavishly decorated. The lower part of the walls covered by onyx slabs composed as one panel. Each of these slabs is decorated with refined paintings. Above the panel there is a marble stalactite cornice. Large expanses of the walls are decorated with painted plaster; the arches and the internal dome are ornamented by high-relief papier-mache cartouches, gilded and painted.
