The Booth Family Mausoleum is the burial place for some members of the Booth family, including the famous silent film actor Milo Booth himself.
The Scooby-Doo Show
The gang investigated there in search of clues about the Phantom of Milo Booth, and discovered what they thought was Milo Booth's empty tomb (actually not his real tomb, but another one re-labeled with his name). The Ghost locked them in there to die when he overheard they had discovered the secret of his Scooby-Dee impostor, but they escaped with the help of physics-defying Scooby-Dum. (The Chiller Diller Movie Thriller)