Notre-Dame Basilica of Montreal is a minor basilica of the Catholic Church in the historic Old Montreal district of Montreal in Quebec, Canada. It is located at 110 Notre-Dame Street West, at the corner of Saint Sulpice Street. It is situated next to the Saint-Sulpice Seminary and faces the Place d'Armes square. The interior of the church is amongst the most dramatic in the world and regarded as a masterpiece of Gothic Revival architecture. The vaults are coloured deep blue and decorated with golden stars, and the rest of the sanctuary is decorated in blues, azures, reds, purples, silver, and gold.