On our first day in Paris in May we went to visit the Père Lachaise Cemetary, a huge cemetary in Paris with over a million people buried there. There is a Crematorium and Columbarium with even more people's remains. It is still an active cemetary; you have to live in Paris or die in Paris in order to be buried there. Graves are often opened and additional family member's remains are placed in the same tomb.
It's a beautiful place with gardens, trees, and a wide variety of tombs and monuments; it is very interesting to walk around in.