Hull, Kingston upon Hull, City of, England, United Kingdom
This 17th century "watchtower" marks the east point of Hull Citadel. Built 1681-90, the citadel was a massive triangular fort incorporating earlier defences alongside the river Hull. It was levelled in 1863-4
Listen to the audio guide for Hull Citadel blue plaque Free on WIP — starts by itself when you arrive, even with the screen off