The Gatehouse at Bonds Mill

The Gatehouse at Bonds Mill at Stonehouse, Gloucestershire, England, was constructed during World War II as a defensive pillbox as part of the Stop Line Green. It is a rare example of a two-storey pillbox with a rooftop gun emplacement and is a Grade II listed building.

Source: Wikipedia — The Gatehouse at Bonds Mill (CC BY-SA 4.0)