Montmartre cemetery is the third largest necropolis in Paris, after Père Lachaise Cemetery and Montparnasse Cemetery.
I can learn history from visiting cemetery, at the same time have a good walk.
Montmartre cemetery has quite some up and down, some tombs are even under a 1888 metallic bridge. This photo below is from Un Jour de Plus à Paris.
This is the most visited grave in Montmartre cemetery, the Egyptian-born singer/actress Dalida.