Open to visitorsan English Heritage site — check opening times and admission before you go
Substantial ruinsruined, but plenty survives above ground
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Upnor Castle is one of six artillery forts the Albion Guide maps in Kent. For more of the same, Rochester Castle and Cooling Castle are close by. The nearest railway station is Strood, 2.2 km to the south-west.
More at the National Heritage List entry