The Catacombs is a underground cemetery.
History[]
Scooby-Doo! World of Mystery[]
The underground cemetery was being terrorized by a sword wielding skeleton, that later brought tons of attention in tourists in search of a golden falcon, an object from a fictional item from "The Maltese Mystery".
An unnamed airport guard actually started the search because he thought the events in the book were true, and created the skeleton by hooking things from his car to an X-ray in order to scare off anyone else trying to look for it.