Boards
Tube/Train stations you go through/hear of every day but have no idea what is outside them or if they even exist
I connect at Canada Water everyday for Underground/Jubilee. Can't for the life of me tell you what or where Canada Water is other than that you can see Rotherhithe station from the platform down the tunnel.
Similarly, I sometimes go through London Bridge station which often proudly states it has trains going to Tattenham Corner which almost definitely does not exist