The exterior of the building features layered stonework in contrasting colours: white Calissane limestone alternates with green sandstone from Golfolina near
Florence. Marble and pictorial mosaics in various colours decorate the upper church. A double staircase leads to a drawbridge, granting access to the crypt and, via another set of stairs, to the church's main entrance.
Crypt The entrance hall under the bell tower features marble statues of Bishop
Eugène de Mazenod and
Pope Pius IX, both carved by
Joseph-Marius Ramus. Staircases on both sides of the entrance lead to the church above. The
Romanesque crypt is composed of a
nave with low
barrel vaults, bordered by six side chapels corresponding exactly to those of the upper church. Unlike the upper church, the crypt is dim and somber. The side chapels contain plaques with the names of various donors. The side altars are devoted to saints
Philomena,
Andrew,
Rose,
Henry,
Louis and
Benedict Labre. The main altar was built of Golfolina stone with columns of Spanish marble. Behind the altar is a statue of the Madonna holding a bouquet, the Vierge au Bouquet. Joseph-Elie Escaramagne obtained this statue for the original chapel in 1804. At first the Madonna held a sceptre, but due to the sceptre's poor condition, it was replaced by flowers. Two staircases flanking the main altar lead to the
sacristy buildings and the choir above, but they are off-limits to the public.
Bell tower At a height of , the square
bell tower above the entrance porch has two identical storeys of five
blind arches, of which the central arch has a window and a small balcony. This is surmounted by a
belfry, with each face composed of a three-light window divided by red granite
mullions, behind which are
abat-sons. The belfry is covered by a square terrace, which is enclosed by a stone
balustrade bearing the arms of the city on each side and an angel with a trumpet at each corner. These four statues were carved by
Eugène-Louis Lequesne. From the square terrace a cylindrical
bell tower rises to a height of . It is made of sixteen red granite columns, supporting a tall statue of the Virgin Mary. A staircase within the bell tower leads to the terrace and to the statue, but is off-limits to the general public. At the base of the tower, bronze doors by
Henri Révoil grant access to the church. The central door panels bear the monogram of the Virgin placed within a circle of pearls resembling the
rosary. The
tympanum above the main entrance is decorated with a mosaic of the
Assumption of the Virgin, patterned after a painting by .
Upper church The nave's interior is 32.7 m long and 14 m wide. Each side chapel measures 3.8 m by 5.4 m. The interior is decorated with of mosaics as well as alternating red and white marble columns and pilasters. Espérandieu wanted a subtle red that would harmonise with the mosaics and not clash too much with the whiteness of the
Carrara marble.
Jules Cantini, the marble worker, discovered such a red marble with yellow and white veins in the
commune of
La Celle near
Brignoles,
Var. For parts higher up, plaster—i.e. reconstituted marble—was used. The mosaics were created between 1886 and 1892 by the Mora company from
Nimes. The
tesserae came from
Venice and were manufactured by craftsmen at the height of their art. Each panel comprises nearly ten thousand tesserae per square metre, which means that the basilica contains approximately 12 million small squares of 1 to . The floors are covered with approximately of Roman mosaics with geometric patterns.
Nave The
aisles of the nave are divided into three equal parts, each with a central window that illuminates a
side chapel. The external
pilasters and arches are composed of alternating green and white stones and
voussoirs. Basement windows at ground level allow some daylight into the crypt's underground chapels. Since the nave is higher than the side chapels, a
clerestory with
two-light windows illuminates the domes of the nave, although these windows are not visible form the terrace. The nave is topped by three
cupolas decorated on the inside with similar mosaics: on a field of flowers, doves form a circle around a central floret. The colours of the flowers differ for each cupola: white for the southeastern one, blue for the middle and red for the northwestern cupola. Medallions on the
pendentives depict scenes from the Old Testament as prefigurations of the Virgin Mary.: File:Arche de Nöé.jpg|
Noah's Ark File:Arche arc en ciel.jpg|
Rainbow covenant File:Coupole1.jpg|Overview File:Echelle de jacob.jpg|
Jacob's ladder File:Buisson ardent-coupole1.jpg|
Burning bush File:Table de la loi.jpg|
Tables of the Law File:Bâton fleuri.jpg|
Aaron's rod File:Coupole2.jpg|Overview File:Chandelier.jpg|
Menorah File:Encensoir.jpg|Incense burner The mosaics of the northwestern cupola depict a grapevine, a lily among thorns, an olive branch with silver leaves and a
date palm.
Transept The
transept is oriented east to west and lit by two paired windows, each with a
rose window above. Above the
crossing of the transept is an octagonal
tholobate supporting a dome of nine meters in diameter, composed of thirty-two ribs and crowned by a cross. Each outward face of the octagon contains a window flanked by two red granite columns and topped by a triangular
pediment. The semicircular
apse is adorned with five
blind arches on the outside, each flanked by two red granite columns. The
sacristy buildings that were added later hide part of the apse. The inside of the dome is decorated with a mosaic of four angels on a field of gold. The angels hold up a wreath of roses which they offer to the Virgin Mary, represented by her monogram in the middle of the composition. The
pendentives at the base of the dome contain representations of the
Four Evangelists:
Mark symbolized by a lion,
Luke by a bull,
John by an eagle and
Matthew by a man. The tympanum above the apse depicts the
Annunciation of Mary: the archangel
Gabriel on the right announces the birth of Jesus to Mary on the left. File:St Jean.jpg|John the Evangelist File:Anges coupole.jpg|Central dome File:Annonciation.jpg|
Annunciation of Mary File:St Mathieu.jpg|Matthew the Evangelist
Choir The white marble altar was designed by
Henri Révoil and constructed by
Jules Cantini between 1882 and 1886. The base of the altar is formed by five gilded bronze arches resting on
colonettes of
lapis lazuli. The silver-gilt
tabernacle is framed by two columns and two mosaics of doves drinking from a
chalice. Behind the altar, a red marble column topped by a gilded
capital supports a statue of Mary, made of
hammered silver by the goldsmith Chanuel of Marseille. The mosaic of the apse's
semi-dome depicts a ship in its central
medallion. The ship's sail features the monogram of Mary, while a star in the sky shows an intertwined A and M, which stands for
Ave Maria. This medallion is surrounded by
rinceaux and thirty two birds, including
peacocks,
parrots,
hoopoes,
bluethroats,
herons, and
goldfinches. The band beneath the semi-dome is decorated with nine medallions, which represent several
titles of Mary from the
Litany of Loreto:
Foederis Arca, Speculum Iustitiae, Sedes Sapientiae, Turris Davidica, Rosa Mystica, Turris Eburnea, Domus Aurea, Vas Spirituale, Ianua Coeli.
Side chapels The aisles on either side of the nave house a total of six
side chapels. Henri Révoil designed and Jules Cantini constructed the altars; Cantini also created the statue of Peter and made it a gift to the sanctuary. Each altar tomb features the coat of arms of its respective saint. The ceiling of each chapel is decorated with a mosaic, depicting the name and arms of the financer on one side and a symbol of the saint on the other. File:Chapelle saint Joseph.JPG|Joseph's chapel File:Chapelle saint Pierre.JPG|Peter's chapel File:Velum3.jpg|Ceiling of Lazarus' chapel File:Chapelle sainte Marie Madeleine.JPG|Mary Magdalene's chapel == Long and meticulous restoration: 2001–2008 ==