Free attractions in Paris?

Someone mentioned in an earlier post about the free attractions in Paris.Apart from gardens, %26#39;%26#39;window shopping%26#39;%26#39;etc,

are there any sights which have free admittance?We will be in Paris late June.

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Hotel de Ville

Notre Dame Cathedral, Sacre-Coeur Cataheral, etc.

Palais Royal

Cemeteries

Street Musicians on the Metro

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All of the Musee de Ville de Paris--Musee d%26#39;Arts Moderne Ville de Paris, Musee Carnavalet, Musee Cognacq-Jay Musees de Balzac, Bourdelle, Henri Bouchard, Cernuschi, Curie, d%26#39;Ennery, Maison Hugo, l%26#39;Order de la Liberation, Pavillion de l%26#39;Arsenal, Edith Piaf, de la Prefecture de Police, du Vin, Zadkine.

For listings of %26#39;..free stuff..%26#39; try navigating this site-- http://www.parisgratuit.com/

Check out some of the self-guided walking tours available:

www.parisbalades.com/Autre/defaulte.htm

www.parisinconnu.com/promenades/index_us.htm

frommers.com/destinations/…0062010008.html

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Thanks to all for your help.