The Palmerston Forts around Chatham, Kent include:
Medieval Rochester Castle
Tudor Upnor Castle
17th century Cockham Wood Fort · Fort Gillingham
Inner Ring (Napoleonic): Fort Clarence · Fort Pitt · Fort Amherst
Outer Ring (Palmerston): Fort Borstal · Fort Bridgewood · Fort Darland · Fort Horsted · Fort Luton · Twydall Redoubts · Fort Hoo · Fort Darnet