A cemetery is a public sacred place where slain people are buried.
The origins of the first cemeteries go back to prehistory and almost squares with the arrival of the first men.

Cemeteries are also an evidence that since the very beginning, men have always tried to understand, as the Monthy Python said, “the sense of life” by analyzing death.
Most religions are based on a Maker worship who is at the root of life, and on a belief that there is an after life, be it Heaven or Hell...
Worship of slain people is thus anchored in all human civilizations, even if it is true that some animals bury their kind.
Cemeteries are places with numerous graves, vaults and chapels, often decorated with religious and commemorative symbols.
The religious and funeral atmosphere of cemeteries is ideal to fund horror stories, legends and myths. Indeed, living dead and vampires often live in those places...

Depending on historical periods, cemeteries have not always been the way they are today. During Ancient Rome, and everywhere else then, there were catacombs. Deaths were buried in sort of underground cemeteries. They can still be visited in some places like Paris.
In the Middle-Ages, in France, the Church supported cemeteries and could decide to exclude people who had been excommunicated, who were then buried in the communal grave. They had not their own burial-place.
Some of the most famous cemeteries are those of Père Lachaise, in Paris, where Jim Morrison and Gainsbourg are buried, and, back on the US soil, the Arlington National Cemetery. J.F. Kennedy, and over 350,000 veterans are buried there.