Pere Lachaise is the most famous cemetery in Paris. Maybe even in the entire world. Many famous people are buried here. There currently is a waiting list to be buried here.
Kayleigh and Kylie wanted to see Chopin's grave so Sara booked a tour of the cemetery. I recommend taking a tour. You could wander for hours in there and still not see many of the famous graves with out one. It was three hours of walking uphill then downhill over cobblestones but it was worth it. It truly is a unique place.
http://www.sightseekersdelight.com I highly recommend them. It was a wonderful tour and very informative. Sarah is well versed on the cemetery and its history.