Monument tube station

According to Jamie McCrimmon's reading of a London Underground map, Monument was a stop on the Circle line between Cannon Street and Tower Hill. Jamie and Gwynfor Evans walked to Monument from Cannon Street in the Underground's tunnels during the so-called "London Event", and were almost immediately beset by the Robot Yetis' webs. (TV: The Web of Fear)

Behind the scenes
Like Charing Cross, Monument has the honour of being one of the few tube stations to be used as a setting for a cliffhanger. Episode 2 of The Web of Fear ends with Jamie and Evans trapped on the Monument platform.