Highland Lawn Cemetery is known for a haunting centered on Martin Sheets, a wealthy man who built a mausoleum with a phone inside, fearing being buried alive. Years after his death, his wife died clutching her own phone, and the phone in Sheets' mausoleum was found off the hook, leading to speculation that he made a call from beyond the grave. The Haunting of Martin Sheets: Martin Sheets was obsessed with the idea of being buried alive. To prevent this, he had a special mausoleum built with a phone inside and inside latches on his casket. After his death, his wife died while holding a telephone. When his mausoleum was opened, the telephone inside was found off the hook. The legend suggests that Martin Sheets, after being buried in his mausoleum, was able to call his wife from beyond the grave. There are reports of various unsettling events occurring within the cemetery, though specific details about other ghosts are less common in the provided search results.