St. Mary's station opened 3rd March 1884 and closed 30th April 1938. The station was closed as a decision of opening the nearby Aldgate East.
What's left today:
Some remains of the platforms, corridors and footbridge at the station still remain at track level. The station building at ground level was badly damaged during the Blitz and later demolished. A hotel now occupies the site of the station building.
A video made by the BBC showing you what's left of the station