Know Before You Go: Entry to Notre-Dame Cathedral is free of charge
Know Before You Go: Modest clothing is recommended (shoulders and knees covered)
Know Before You Go: Expect standard security checks before entering the cathedral
Know Before You Go: The tour involves walking and standing; comfortable shoes advised
Know Before You Go: Children must be accompanied by an adult
Know Before You Go: The cruise (if selected) can be enjoyed after the tour at your own pace