It's Part 2 out of the 11 tube lines in our series 'Secrets of the Underground'. This time, Geoff Marshall takes us on a tour of the Northern Line, looking for unusual features including unfinished platforms, secret escalators, fibbing signs and even a plastic owl!

All of the videos in this series are in this playlist here:    • Secrets of the Victoria Line  

If you like this, you might also like this - a history of how the Northern Line was built:    • The Northern Line of the London Under...  

Also - visit the website www.Londonist.com for a daily dose of London news, features and trivia.

And thanks to everyone for taking the time to translate the subtitles into another language ....