Tower Hill Postern

The Tower Hill Postern is a medieval gatehouse that sits hidden beneath the modern bustle of London, visible today only within the pedestrian subway connecting Tower Hill station to the Tower of London. Built between the late thirteenth and early fourteenth centuries, this structure once served as a secure, secondary entrance to the City of London, designed specifically for pedestrians and horsemen rather than bulky trade wagons. Its positioning was strategic, marking the eastern terminal point where the ancient London Wall met the defensive moat of the Tower of London. The gatehouse faced immediate engineering challenges due to its proximity to the soft earth of the Tower moat. In the mid-fifteenth century, the southern tower suffered a dramatic structural failure, sliding vertically about three meters downward into the marshy ground. Despite this collapse, the gate remained in use for centuries, serving as a testament to the durability of medieval construction techniques. Archaeologists eventually rediscovered these foundation ruins in 1979 while excavating for the current pedestrian tunnel, providing a rare glimpse into the defensive perimeter that once defined the city.