Free Places that you recommend we go in Paris

I was going to recommend the Luxembourg Gardens but you beat me to it - lol. It’s my favorite place in Paris... : )

My favorite thing to do in Paris is to walk and explore neighborhoods. Free, fun and very rewarding.

Walk around the outside of famous buildings.

Go into shops to look around

Saint Germain des Pres and Saint Sulpice.

Observation deck at the top of Galleries Lafayette.

The Canal St Martin

St Denis Basilica, Montparnasse Cemetery, Pere Lachaise Cemetery

Trocadero. Views of the Eye-full Tower.

I'd have thought that a Robot, especially a Math Robot, would have enjoyed a visit to Cité des sciences et de l'industrie at the top of the Canal St Martin, beyond the Bassin de la Vilette. Unfortunately not completely free, but maybe you could have a look around. Very high tech.

Terrace on top of Institute Monde Arab -- great view of Notre Dame from above.

Take the 6 metro from Place d'Italie and get off at Nationale and walk around this area up to the metro at Chevarelet. There are about 20 professionally done and varied wall murals in this area -- you can see some from the metro but others are more hidden -- and if you spend some more time on side streets you will find even more. Then continue on to the river which is a pleasant walk or if you have a metro pass you can hop back on the metro and go a stop to Quai de la Gare and get off. This is near the Mitterand Library. Then walk down the river on the left bank. Lots of pretty parks and views along here and some cafes for a break -- in summer we have stumbled on various festivals as well. when you get to the islands you can cross over, perhaps Pont Sully and explore the central islands. Lots of nice parks etc.

The Passages are old fashioned shopping malls. Vivienne is the prettiest, but there are a whole series of them sort of end to end and so you can map out a stroll that covers several of them. They tend to be filled with quirky shops.

All the big parks are worth a visit. Butte Chaumont, Bercy, Montsouris, Bois de Boulogne and Park Vincennes and of course Luxembourg Gardens, Tuilleries and Monceau.

On the far side of Vincennes there is the crumbling remains of the human zoo used during an exposition at the end of the 19th century. There were pavillons from the different colonial countries and people from those countries 'lived' in the pavilions so they could be viewed by visitors to the exposition. When we were there we found an automatic shuttle near chateau Vincennes that meandered across the park and so covered a large part of the ground (it is a huge park). You need a map or to have goodl mapped it out to find things like the lakes and the exposition grounds.

The Petit Palais is a free museum, with some great pieces. At least in May 2018, it wasn't crowded.

Not free, but if you're getting a Paris Museum Pass anyway, note that the Arc de Triomphe is included. I go up twice on each trip - once by day and once by night.

I also love the Trocadero for a great Eiffel Tower view.

If you like Art Nouveau, you can find some walks online that take you to great examples. Whatever you do, don't miss 39 Avenue Rapp in the 7th:

https://www.google.com/search?q=39+avenue+rapp+paris&source=lnms&tbm=isch&sa=X&ved=0ahUKEwil3Na137TjAhU9AZ0JHS_MCfwQ_AUIEigD&biw=1920&bih=966

The Promenade Plantee is a former elevated railroad converted into a green park, fine for strolling. Also known as the Coulee Verte Rene-Dumount (on Google Maps), it runs nearly three miles from near the Opera Bastille to the ring road at the east side of the city centre. At the Bastille end, the old arches holding up the viaduct now shelter specialized shops I think they may be subsidized for artisans. The one selling music stands intrigued me.
PS: The promenade opened in 1993, well before the New York version.

https://en.wikipedia.org/wiki/Coul%C3%A9e_verte_Ren%C3%A9-Dumont#Description

The Curie Museum, a few blocks south of the Panthéon. Free, not big but worth a visit that will take no more as an hour.

The Pavillon de l’Arsenal is a museum of architecture and urbanism, steps from the Arsenal basin. It is free to enter, about 9 people in the place when I was last there, and a quiet place to spend an hour if you are at all interested in the planning of the City of Paris over the past few hundred years.

In one of your other threads someone may have recommended the video walks from Corey Frye, a French Frye in Paris. I watch them then work in some of his cool recommendations when I am walking on my own in Paris.

https://www.youtube.com/channel/UCfrkg0WfgjM_rh9YOoXfuhw

The Tuileries Gardens are also free as is the whole esplanade area up to the Eiffel Tower. You can't walk under the Tower for free any longer (security) but you can walk around the base and look at it from different angles. You do need to be on your guard here as the "petition girls" are sometimes out and about. The African Trinket sellers don't usually bother people.

I agree with the church recommendations. They often will have a guide in the back to point out important sculpture or other interesting things. In addition to Saint-Sulpice ( the Gnomen is neat - https://en.wikipedia.org/wiki/Gnomon_of_Saint-Sulpice) and Saint-Germain-des-Pres ( https://en.wikipedia.org/wiki/Abbey_of_Saint-Germain-des-Pr%C3%A9s ), I like Sainte-Etienne-du-Mont which has the supposed bones of Sainte-Genevieve the patron Saint of Paris and was featured in the film Midnight in Paris. Corey Frye also takes you in to the church of Saint-Paul Saint Louis near the Saint Paul Metro stop. The cool thing to me here is some revoluntionaries were pinned in the church and scrawled on a pillar, possibly in blood, "Republique ou la Mort" and it won't come clean! https://en.wikipedia.org/wiki/%C3%89glise_Saint-Paul-Saint-Louis )

Pere Lachaise Cemetery is free - do some research ahead on this forum and in Rick's book.

Rick has some free walks in his guidebook and here on the website. Go to "Watch, Read, Listen". Click on Audio Tours.

I'll also add this. Most forum posters like feedback from the person who asks the question so it's polite to come back to a thread and make some kind of comment so we know you've read it and can answer any further questions.

The cemeteries are truly interesting, beautiful, and park like - Pere Lachaise, Montmartre, Montparnasse. There are others but those were the ones I got to. Strolling the Seine is free and if the weather is nice it's the nicest way to spend an evening in Paris. Lots of smaller, less well known, museums are free. Check this website. And the churches, many of them anyway, are free and they are wonderful.

Thank you guys for your responses. There are so much to see in Paris!!