Overview: With a line-up of hair-raising Halloween picks, the guys crawl back underground in Pennsylvania in search of the "Mole Man." Later, the guys look for rusty relics at an abandoned Oklahoma amusement park. In Missouri, Mike and Frank tour a former penitentiary with a seriously spooky vibe. Notorious for hauntings, the massive institution is one of the darkest and creepiest places they've ever picked.