#1st in the world to run beneath a river, the #ThamesTunnel attracted an influx of curious pedestrians & small stall-holders when it opened in 1843. Connecting #Wapping to #Rotherhithe, it is now part of #LondonTransport’s overground. The tunnel is still used by trains & the nearby #BrunelMuseum give visitor tours to explore #Victorian engineering & discover #LostLondon.