Three architects supervised the construction from father to son, Cordonnier –
Louis Marie, and his son Louis-Stanislas Cordonnier and his grandson Louis Cordonnier. The Roman-Byzantine style of the basilica was inspired by the
Sacred Heart Basilica in Paris. The building is shaped like a Latin cross, with a nave, choir and transept. An imposing dome surmounts the crossing. The internal volume is all in one piece, without collateral or ambulatory aisles. Due to the absence of columns, all who attend mass have an unobstructed view. Much of the basilica's interior is covered with mosaics. The basilica also has an unusually long reverberation time of over 11 seconds.
Crypt Completed in 1932, the crypt evokes the secret of the spiritual life of Saint Thérèse. It is decorated with marble and mosaics representing certain scenes from the life of Saint Thérèse: baptism, first communion, miraculous healing, commitment to religious life, death. In the summer of 1944, the townspeople who remained in Lisieux took refuge in the basilica's crypt. The Carmelites of Lisieux, including Saint Thérèse's two surviving sisters, lived in the basilica's crypt that summer. Built in 2000, the worship chapel is a place for silent prayer and can be entered through the crypt. The Irish ex-voto offered it to Saint Thérèse. == Exterior ==