Grave steles are replicas (originals are in the National Archaeological Museum and the Keramikos Museum).
Sacred Way runs right by it on its way from Eleusis, through the Dipylon Gate, up to the Acropolis.
Guide books will tell you to look for tortoises and frogs in the cemetery. They aren’t kidding:
The University of Pennsylvania Museum of Archeology and Anthropology has an excellent museum display of the Keramikos. See their website for an intro: http://www.museum.upenn.edu/Greek_World/cemeteries.html