This definitely falls into the category of things your mom told you not to do. Weird NJ correspondent “Wheeler Antabanez” (a.k.a. Montclair writer Matt Kent) went to the Hilltop to explore the tunnels that once ran under the sanatorium buildings there–and then posted a video on YouTube. Baristanet has a piece about it, and there’s a teaser on the Weird NJ Web site.