The grand exterior is complemented by the two towers, known as Montréal’s Twin Towers. La Persévérance (Perseverance), the nickname for the west tower housed a single massive bell weighing 11 tons (11,000 kilograms). La Tempérance (Temperament), the nickname of the east tower, on the other hand, houses a carillon of 10 bells.
“The church’s Gothic Revival architecture is among the most dramatic in the world; its interior is magnificent and colourful, its ceiling is coloured deep blue and decorated with golden stars, and the rest of the sanctuary is a polychrome of blues, azures, reds, purples, silver, and gold. It is filled with hundreds of intricate wooden carvings and several religious statues. Unusual for a church, the stained glass windows along the walls of the sanctuary do not depict biblical scenes, but rather scenes from the religious history of Montreal.” (Wikipedia)
Entry is free for those attending religious services, but it costs $5 for visitors. It is not too expensive considering its remarkable interiors.
More information is available from the Notre-Dame Basilica of Montréal website: http://www.basiliquenddm.org/en/basilica/