The Church, one of the most beautiful and magnificent heritage buildings in Ontario, is as rich in its interiors as it is in its history, housing numerous nationally important heritage items, among them:

• Hand-carved Wooden Pulpit: Hand-carved in 1793 by Freret.
• Painting of the Assumption of the Blessed Virgin Mary: Original by Murillo, copied by renowned Canadian painter Antoine Plamondon and donated in 1845.
• Main Stone Altar: Imported from Caen, France in 1887.
• Stained Glass Windows: Acquired from 1874 to 1920.
• La Pietà and the Statues of St. Joseph and Ste. Anne: Acquired between 1889 and 1890.
• Bellfry Bell: Installed in 1893.

The general public, including tourists, enjoy visits to the Church appreciating its gifts as a living museum.