So to east Hull and a remnant of 16th & 17th century defense spending. This is nearly all that remains of a massive citadel that protected the approaches to Hull from attack by whoever the English government had annoyed at the time (probably most of Europe). There is a blue plaque to tell the passing stranger all about it; unfortunately it's so high up that it's almost unreadable. I had to take a photo just to find out what it said. This stump sits in the middle of a large modern housing estate.
Some of the citadel's demolition material was used to create the charmingly named Khyber Pass feature ( from a futile intrusion by Victorian Britain into Afghanistan, all part of the never ending great game ) in East Park. It's just a glorified rockery really. Sic transit, as they often say in these parts.