Oratoire Saint-Joseph du Mont-Royal

This enormous domed basilica is visible from across the city, and it's free to enter. Beyond the religious significance (it's a major pilgrimage site), the architecture is staggering and the renovated observatory at the top gives a different city panorama than the main lookout. It's a bit out of the centre, so plan a half-day, but it's one of the genuinely awe-inspiring sights.

The vast domed basilica on the mountain's northwest slope — one of the world's largest church domes, free to enter, with an observatory and city view.

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