That cemetary is 146 years old.
http://www.oldnewark.com/cemeteries/holysepulchre.htm
I grew up by a cementary even older than that. I use to sneak in to read the tombstones when I was little.
There are graves there from the 1700s. Rumor had it that one of the tombs there was had a passage to the underground tunnels.
I was never brave enough to try to look for that in a grave yard, but some of the stones really had spooky stories on them.