|This needs a stretch.|
The graveyard is in the same town as Mrs. Vandereel's mansion.
Sometime before Scrappy-Doo joined the group, a mystery involving the Red Skull lead the Mystery Inc. gang to this location. After splitting up into an unusual pairing, Shaggy Rogers, Velma Dinkley, and Daphne Blake, as a group, were separated from Fred Jones and Scooby-Doo. After an encounter with the Red Skull, Fred and Scooby ventured into the graveyard's crypt to hide.