The Tube is full of surprising oddities and historical quirks. You probably walk right past a few every day, without ever noticing. With over one million views on YouTube, the Londonist series SECRETS OF THE UNDERGROUND became an online hit between 2013 and 2014. Geoff Marshall tours the Tube line by line, revealing the hidden histories and secret corners of the network. You will fall in love, all over again, with the world s oldest underground passenger railway, including a look at abandoned stations and the Docklands Light Railway.