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Yes, all guillotines have been dismounted. Public executions are no longer popular, and even the memory of them is not something most people want to face. While executions were originally public, they gradually became less so: execution times changed over the 19th century to happen in the dead of the night, then at dawn; in 1939 (a lot later than in most other European countries) the law requiring executions to be public was repealed and executions were henceforth held in prisons.
Nowadays, you'll find guillotines in museums or in private collections throughout the world. The French Wikipedia article gives the whereabouts of a few of them. This is not an exhaustive list by any means.
According to this thread, the last guillotine that was in operation is now in the Gendarmerie school in Fontainebleau (not publicly accessible).
Upvote:3
There's one in the Museum of Police next to an actual police station in Paris, Quartier Latin. Address: 4 rue de la Montagne Sainte-Geneviève - 75005 Paris
Upvote:8
I know the cat garden in Dubrovnik has one, I even took a photo of it myself: