The tower on the right is Fishergate Postern Tower and was built around 1504, the tower on the left is called The Postern Gate and was built in 2002. One was designed to complement the other and I do think they look rather well together. Fishergate Postern was originally an open topped tower with crenellations but a tiled roof was eventually added. The hole in the city walls next to the tower is the remains of a small Postern gate - the Posternam
iuxta Skarletpit - meaning the Postern next to the Scarlet Pit.