We have an exclusive clip from the Season 3 premiere of Cities of the Underworld, which airs on Sunday, October 26 at 9 PM ET on the History Channel. Click below for our exclusive glimpse at the City of Blood episode before the premiere.

Don Wildman is back, and he's tearing through the streets of the world's most famous cities to uncover secrets hundreds of feet beneath the pavement. Part history buff, part urban explorer- Don tells the story that you don't get above ground. This season, he takes viewers into meandering combat tunnels, mafia escape routes, underground vaults, secret surveillance nerve centers, and forgotten underworlds that have been lost to the hands of time.