You'll probably spot Le Havre Cathedral in the skyline before you actually find this grand place of worship. Look around inside if it's open or just take in the facade from outside.
This Downtown Le Havre principal church is an interesting spot to kick off your day of sightseeing. There's lots to discover close by, such as Carré des Docks, Le Havre Beach, and University College of Sciences Po: Le Havre Campus. Wander around at your leisure at Le Havre Cathedral before heading to these other fine attractions.