Eglise de la Sorbonne was constructed from 1635 to 1642 by the famous architect Lemercier. The church has a Baroque facade and an elegant cupola that makes it look really big. The interior of the church is also quite impressive and the marble tomb of cardinal Richelieu lies within its walls.

Saint-Nicolas-du-Chardonnet is a Roman Catholic Church in the centre of Paris. Traditional Society of St Pius X occupied it in 1977and it remained in the society's possession to this day.

Originally built in the 13th century, the church was reconstructed between 1656 and 1763. In 1612, Adrien Bourdoise founded a training college for priests at Saint-Nicolas. In the late 17th century, famous harpsichordist Jean-Nicolas held a formal position as an organist of the church. In the 19th century the adjacent Mutualité site was occupied by a seminary. The church was under the custody of the city of Paris since 1905 but gave the Roman Catholic Church the right of the free usage.

On June 22, 2002, the municipal council of Paris passed a resolution that the Society of St Pius X should be expelled from the church. Mayor Bertrand Delanoe was against this proposal considering it an internal matter of the Catholic Church.
Since there was no forward-facing altar, the original plan of the Church including the High Altar could be seen without distraction. There were plenty of side altars which were normally used as storage spaces or display rooms.

The organ of Saint Nicolas du Chardonnet came from the old parochial church of Saints-Innocents. It was built by François Thierry between 1723 and 1725. Many changes were made to the interiors of the church over time. In 1897, Merklin rebuilt the instrument and the old wooden tribune was replaced by a tribune of stone. A renovation was done in 1961 by Roethinger and Boisseau, including the electrification of the instrument. During 2007-2009 the organ was rebuilt by Michel Gaillard.

On a typical Sunday about six Masses are sung herewith out interruption. It is the society's only church in the city of Paris and although it is not their official French headquarters it is seen as their national centre.

Notre Dame Cathedral is the most remarkable monument not only in Paris but also in Europe. This Catholic treasure is over 800 years old. It is located on a small island called the Ile de la Cite in the middle of the river Seine. The cathedral took 200 years to build and was completed in 1345. Notre-Dame’s first stone was laid in 1163 in the presence of Pope Alexander III. Several architects were employed during the construction period resulting in different styles that can be seen at the west front and towers. The most significant change in design came in the mid 13th century. It was among the first buildings in the world to use the arched exterior supports.

Many glorious and the tragic historical events have taken place in the Notre Dame Cathedral. King Henry VI of England was crowned inside the cathedral in 1431. The Cathedral was at one time in bad state and close to the point of being demolished, but was later saved by Napoleon who himself was crowned inside the Cathedral in 1804. 

After restoring the Cathedral back to its former beauty and in the midst of World War II, it was feared that the German soldiers might destroy the newly installed stained glass. It was therefore removed and only reinstalled again after the war had ended. The steps were taken to save only one particular archeological glass window called the Rose window which is supposed to be the biggest glass window in the world produced in the 13th century.

History of the Notre Dame Cathedral would not be complete without discussing the famous story of the peasant girl Joan of Arc. She was very brave and had spiritual and character richness. Through her visions and courage, she helped France in the battles against the English troops. On the 7 July 1456, she was declared a martyr. In 1909, Pope Pius X beatified her in the cathedral. 

Notre Dame Cathedral is still in use today by the Roman Catholic Church for Sunday mass and it is the seat of the Archbishop of Paris. Also inside is the 17th century organ with all of its parts still functional. Another notable and distinct historical artifact is the famous bell that has been redesigned to ring automatically. Any visitor to the bell tower should be prepared to climb the 140 steps staircase, if desirous to see the historical bell or to have a bird's eye view of the city of Paris.

In 1991, a program was made to restore the cathedral which was supposed to be completed in ten years but extended for more than 18 years. Due to the talents and techniques of the Historical Monuments restorers, it has become possible to admire the splendor of this jewel of medieval architecture.

Saint-Julien-le-Pauvre, in full Église Saint-Julien-le-Pauvre (French for Church of Saint Julian the Poor), is a Melkite Greek Catholic parish church in Paris, France, and one of the city's oldest religious buildings. Built in Gothic style during the 13th century, it is situated in the 5th arrondissement, on the Left Bank of the Seine River. Originally a Roman Catholic place of worship, Saint-Julien-le-Pauvre was built in stages from the 12th to the 19th century, and granted to Eastern Catholic Melkite community in 1889. Its original design was modified several times, and the resulting church is significantly smaller in size than originally planned. The church was dedicated to two medieval French saints of the same name: Julian of Le Mans and a figure from the region of Dauphiné. "The poor" is said to originate from Julian of Le Mans, whose dedication to the cause of the poor was considered exemplary.

The Church of Saint-Séverin is a church in the Latin Quarter of Paris, located on the lively tourist street Rue Saint-Séverin. It is one of the oldest churches that remains standing on the Left Bank, and it continues in use as a place of worship. The church is dedicated to Séverin. Its external features include some fine gargoyles. Its bells include the oldest one remaining in Paris, cast in 1412; their ringing is recalled in a well known poem in praise of Paris by Alan Seeger. Internal features of the church include both ancient stained glass and a set of seven modern windows by Jean René Bazaine, inspired by the seven sacraments of the Catholic church, around the ambulatory.

Saint-Sulpice Church is the second largest Roman Catholic church in Paris. Saint Sulpicius, the patron of the church, was a 7th-century bishop of Bourges famous for his godliness and his confrontation to the dictatorship of the Merovingian kings. The church was named after him because of his contributions and divine dedication for Christianity. Though the construction had begun in 1646, it took 100 years for the church to reach to its final stage of completion.

Church of Saint-Sulpice was destroyed and changed into a Temple of Victory during the Revolution but later restored and redecorated in the 19th century. It is a masterpiece of architecture. Natural light lets in through large arched windows. Elegant columns stood inside the hall including two mismatched columns. Two enormous shells resting on rock-like bases are present at either side of the front door. These are sculpted by Jean-Baptise Pigalle and given to French government as a gift. A fountain displaying sculptures of four bishops of the Louis XIV era stands in the church square.

A distinguished role of the Church of Saint-Sulpice in the recent bestselling novel The Da Vinci Code, have increased its popularity among the tourists. A golden line implanted in the grey granite floor run across the church's floor. It bears graduated markings, like a ruler. It is a gnomon, a pagan astronomical device like a sundial. Tourists, scientists, historians and pagans from around the world come to look at this famous line. The famous line on the floor of Saint-Sulpice, was actually laid into the floor in 1727 by a clock maker and astronomer in order to “fix the date of Easter.”

St. Sulpice has one of the finest and stunning pipe organs in the world with 6,500 pipes, 102 stops, and five layered keyboards. The previous organ of 1781 was replaced by the new one in 1862. It is more than 20 meters tall and even people who do not have interest into organ music are amazed to see the overall size of the Saint-Sulpice organ. Those interested in organ music must visit the church on Sunday to hear one of the weekly free organ concerts.

Saint Germain des Prés is the oldest church in Paris. Originally, it was a little market town emerged around the abbey of St. Germain, and was established by Childebert to accommodate a relic of the True Cross delivered from Spain in 542.

In the Middle Ages, the Church of St Germain des Pres was very influential in both religious and cultural senses. Although eventually the neighboring abbey was totally destroyed by the Normans, the church was left unharmed.

In 1163, it was enlarged and re-consecrated by Pope Alexander III. The current building is an excellent example of Romanesque architecture. The square tower, which dates back to the early 11th century, is topped by the church's landmark spire, pertaining to the 19th century. Inside the church is a Romanesque nave and a Gothic choir with gilded capitals. The marble columns present here are the only survivors of the 6th century abbey church, which was once a pantheon for Merovingian kings. Its pillars are carved with the copies of the capitals, the originals of which are kept in the Musée National du Moyen-Age.

In the course of the 1981 restorations, a number of Romanesque paintings were discovered on the triumphal arch. Recitals, featuring Gregorian singing, are often held here in large part due to the building's great acoustics and medieval ambiance.

Saint Germain des Prés, in a true sense, is well worth a visit.