The chapel's exterior is straightforward and rather sombre, where the Rayonnant Gothic chapel has deep buttresses and large windows (15 m) split by bar tracing. In reference to the first relic Louis IX brought into the chapel, the latter is topped with pinnacles adorned with crockets and thorny crowns. The chapel's entrance is hidden beneath a portico, whose tympanum symbolises the coronation, along with a Virgin and Child shown on the trumeau. A more elaborate porch with a tympanum that symbolises the Last Judgement is located above it, with a spire was built in 1853 and rose 75 metres above the street.

Built to hold a reliquary, Saint Chapelle Paris resembled a priceless shrine that had been turned inside out. Although the stained glass dominates the inside, every square inch of the vault and the remaining wall surfaces was likewise lavishly colored and ornamented. The original colours were significantly brighter than those preferred by the 19th-century restorers. They would have been closer to the colours of the stained glass, according to an analysis of residual paint pieces. Rich textile hangings complemented the interior's richness. The quatrefoils of the dado arcade were painted with pictures of saints and martyrs and inset with painted and gilded glass, mimicking Limoges enamels.

Two of the main architects of the 19th-century restoration, Durban and Lassus, used a neutral tone in the soubassements. The lower areas where no traces of the original hue were discovered, to avoid clashing with the colours of the Stained Glass Windows can be seen after restoration. They drew inspiration from the Psalm book illuminations from the Royal Library's 13th-century collection for their colour scheme for other ornamentation. On the stone arches of the soubassements, they meticulously repainted the forty-four quadrilobe medallions from the 13th century, which showed saints being martyred against a gold background.

The cathedral church in Paris is known as Notre-Dame de Paris or Notre-Dame Cathedral. It stands out for its size, age, and architectural interest and is the most well-known of all the medieval Gothic cathedrals. It was constructed on the ruins of two earlier churches and is located near the eastern extremity of the Île de la Cité. Bishop of Paris Maurice de Sully was the driving force for the cathedral. A choir and apse, a brief transept, and a nave flanked by dual aisles and square chapels make up this structure.

The construction of Paris's oldest bridge, Pont Neuf, which spans the Seine River via the Île de la Cité, took place between 1578 and 1607 despite delays. Possibly drawing inspiration from an earlier design by Guillaume Marchand, it was created by Baptiste du Cerceau and Pierre des Illes. Its "short arm" was made up of five arches from the island to the left bank. While its "long arm" was made up of seven arches from the right bank of the Seine to the western edge of the Île de la Cité.

The Musée de Cluny, officially known as the Musée National du Moyen ge, is two museums combined together. The larger part is covered by the Middle Ages, and the second portion of it is located inside France's biggest remaining Roman bath. The Cluny Abbot constructed the beautiful mediaeval palace that served as the museum's primary space in 1330 and had it renovated in 1510. It was formerly a private dwelling and is one of Paris's oldest structures.