What to see: Musée des Éclairages anciens
Where it is: Lumière de l’oeil – 4, rue Flatters – 5e (map)
When it’s free: Tuesday to Friday – 2:00 PM to 7:00 PM
Saturday 11:00 AM to 5:00 PM
How to get there: Les Gobelins M7 or RER Port-Royal
What to see: Musée des Collections Historiques de la Préfecture de Police
Where to see it: Hôtel de Police – 4, rue de la Montagne Sainte-Geneviève (3rd floor) – 5e (map)
When it’s free: Monday to Friday – 9:00 AM to 5:00 PM
Saturday – 9:30 AM to 5:30 PM
How to get there: Maubert-Mutualité M10
What it is: Musée du thé Mariage Frères
Where it is: 30, rue du Bourg-Tibourg – 4e (map)
When it’s free: Daily – 10:30 AM to 7:30 PM
How to get there: Hôtel de Ville M1, M11
What to see: Église Saint-Louis-en-l’Île
Where it is: 19bis, rue Saint-Louis-en-l’Ile – 4e (map)
When to see it: Daily
Monday to Saturday – 9:00 AM to 1:00 PM & 2:00 PM to 7:00 PM
Sunday 2:00 PM to 7:00 PM
How to get there: Pont-Marie M7 or Saint-Paul M1
What it is: Église Saint-Paul – Saint-Louis
Where it is: 99, rue Saint-Antoine – 4e (map)
When to see it: Daily – 8:00 AM to 8:00 PM
How to get there: Saint-Paul M1
What it is: Musée de l’Assistance Publique – Hôpitaux de Paris
Where it is: 3, avenue Victoria – 4e (map)
When it’s free: Currently Closed for Renovations
How to get there: Hôtel-de-Ville M1, M11
What it is: Cathédrale Notre-Dame-de-Paris
Where it is: 6, parvis Notre-Dame, place Jean-Paul II – 4e (map)
When to see it: Daily – 8:00 AM to 7:00 PM
How to get there: Cité M4 or Saint-Michel-Notre-Dame RER B, RER C
What it is: Église Saint-Gervais – Saint-Protais
Where it is: Place Saint-Gervais – 4e (map)
When to see it: Daily – 5:30 AM to 9:00 PM
All night Thursday to Friday
How to get there: Hôtel-de-Ville M1, M11
What to see: Pavillon de l’arsenal
Where it is: 21, boulevard Morland – 4e (map)
When it’s free: Tuesday to Saturday – 10:30 AM to 6:30 PM
Sunday – 11:00 AM to 7:00 PM
How to get there: Sully-Morland M7 or Bastille M1, M5, M8
What to see: Mémorial de la Shoah
Where it is: 17, rue Geoffroy l’Asnier – 4e (map)
When it’s free: Sunday to Friday – 10:00 AM to 6:00 PM
Thursday until 10:00 PM
Closed Saturday
How to get there: Saint-Paul M1 or Hôtel-de-Ville M1