King's Hollow Tunnel in Ohio offers a creepy hiking experience through an abandoned, timber-lined railroad tunnel.

Deep in the heart of Maine’s Allagash region, two ghost locomotives rest in the wilderness, far from any road or railhead.

Good morning! I’ll be on vacation for a week, and a few colleagues will fill in while I’m gone. See you in November. But first, we’re going underneath the streets of Boston to look at 10 unsolved, ...