One of a number of forts built in the 1850s and 1860s to protect Portsmouth and its vital harbour against a French invasion. Largely unaltered, the keep, the parade ground, gun ramps, moated keep, washrooms and armoury can all be viewed.

Information:

Gunners Way, Elson, Gosport, Hampshire, PO12 4DS

https://www.english-heritage.org.uk/visit/places/fort-brockhurst/