Saint-Sulpice is the 2nd largest Roman Catholic church in Paris. Every small part of this classic church including the dome, towers and even the pillars of this church was designed and built so meticulously, that it will make you astonished with its elegance.
As a music enthusiast, Schweitzer played the organ at Saint-Sulpice, Paris, for Charles-Marie Widor, a French organist. Charles-Marie Widor had a great influence on Johann Sebastian Bach's organ music. His music is known to be containing a magical sense of the eternal.
Source: Wikipedia