The only architectural monument in the area of New Sylvia in Pavlovsk Park is the Mausoleum of Paul I. It is not the tomb of the Emperor. Paul I, like all members of the Imperial family, was buried in the Peter and Paul Cathedral in St. Petersburg. In the archival documents it Park building is called "the Monument in the city of Pavlovsk". In one of his letters to the Empress Maria Feodorovna mentions it as "the Monument", and the contract with the architect Carlo Domenico Visconti calls the "Temple". Modern name — Spouse-Benefactor" or "Mausoleum of Paul I".

Wanting to perpetuate the memory of her late husband, the Dowager Empress Maria Feodorovna, ordered several architects projects of the monument. In 1805 she approved the design work of the architect Thomas de Tomon, in which the master put the motif of the facade tombstone Sophia Dorothea, the mother of Maria Feodorovna, buried in Charlottenburg.

In 1805 summer was carried out the laying of the Mausoleum. His erection was doing this master K. Visconti. Memorial structure without burial or, in other words, a false tomb (Cenotaph) was sculptured by the famous Russian sculptor Ivan Petrovich Martos. In 1810, a solemn opening ceremony of the Mausoleum.

The mausoleum Spouse-benefactor placed in the depth of the Pavlovsk Park, difficult passable forest, on the Bank of the ravine. It is made in the shape of a little Greek temple-Pro-style, with chetyrehkolenny portico. Doric columns, carved from red granite, interspersed with grey marble capitals. The tomb's walls were made of brick, Sandstone yellowish. The doorway is in the center of the main facade. On the pediment of the doorway is an inscription made of embossed gilt letters to Husband-Benefactor". In addition, on the southern gable can be read: "Paul I Emperor and Autocrat of all Russia. Born September 20 th day 1754. Died March 11 th day of 1801".

In the Mausoleum are high fishnet door of iron, made from sketches by Thomas de Thomon. Gilded funerary emblems: inverted torches and vases-Lesnica are available on the door bars. The tomb's walls faced with artificial marble white colors. Below it is shaded by a high panel of marble dark grey. The relief depicts the figure of "the Allegory of History", made by the sculptor Jean-Baptiste Nadanam.

On the South wall, or rather on the high relief in the centre, on a low pedestal there is a picture of the urn, covered with drapery. Folds mournful bedspreads is widely spread out and fill the whole of the Central high-relief part. On the sides of the urn has two weeping figures of cupids, in the hands upside – down torches. On the right side of them – the globe, with the left – palette with brushes. Sculptural ensemble "Grieving of science and art" belongs to the sculptor Joseph Chamberline. Sketches for both reliefs were designed by the architect Thomas de Thomon.

The premises of the Mausoleum is made in stressed ascetic manner. All the attention is drawn by the monument. Here, amid the granite pyramid dark red tone sculptural composition made of white marble. We see the kneeling woman in antique clothing in sorrow cling to the urn. The crown on her head – a testimony Sana mourners. The sculpture is located on a high pedestal and is decorated with a bas-relief, which in allegorical form shows all children of Paul I, at the time of his death, namely, on March 11, 1801. The pedestal and the pyramid belong to the work of the stonecutter Samson Sukhanov.

During the great Patriotic war Park pavilion Mausoleum Spouse-benefactor and the Cenotaph were destroyed. After the war there was organized a big recovery.