Every season of Secrets of the London Underground ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Secrets of the London Underground!

Railway historian Tim Dunn and Siddy Holloway from the London Transport Museum explore hidden areas of the London Underground that—despite being just feet away from where millions of people regularly travel—hardly anyone knows about. The pair will explore abandoned tunnels, secret bunkers and hidden staircases that have been concealed from public view for years.

The Best Seasons of Secrets of the London Underground

Every season of Secrets of the London Underground ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of Secrets of the London Underground!