Notre-Dame Cathedral
- Monday to Friday: 7:45am to 7pm
- Saturday and Sunday: 8:15am to 7:30pm
- Last entry is 30 minutes before closing time
- Best time to visit: Early in the mornings from Monday to Thursday and during September through November and January to February.
Archaeological Crypt of the Île de la Cité:
- Tuesday to Sunday: 10am to 6pm, with last entry at 5:30pm
- Closed on: Monday
- Best time to visit: During September through November and January to February. Arrive just when the crypt opens to avoid the crowds.