@markhburton @olynch I came here to say this! I've never been there yet, but there was a documentary series on TV about Albert Kahn and his collection (colour photos from around the world BEFORE WORLD WAR I) some ten years ago or so, and I've wanted to see it ever since.

Another place maybe worth visiting: the urban forest that has replaced the open square in front of the Hôtel de Ville (City Hall). Not far from Notre Dame. https://parissecret.com/en/urban-forest-parvis-hotel-de-ville/