Defensible Barracks, Pembroke Dock - Credit: Wikimedia Commons
The Defensible Barracks at Pembroke Dock, is a Grade II* listed, Victorian-era fortification and barracks in Pembrokeshire, South Wales. It is a 20-sided stone fort surrounded by a dry moat with masonry walls. A parade ground occupies the centre of the fort. It was built in the mid-1840s to house the Royal Marines based in Pembroke Dockyard and to protect the dockyard. Read more on Wikipedia
Source: en.wikipedia.org