The Neidpath Train Tunnel in Peebles, Scotland is a spooky abandoned tunnel that was once used during World War II. Stretching nearly half a mile long, this desolate tunnel was a key part of the Peebles-Symington railway extension. It's said to have been a hiding spot for the royal train and was used to transport materials for the war effort. The darkness inside can be pretty intense, so bring a flashlight if you decide to explore this eerie piece of history!