The Fort can be visited
FortressMedway
Grain Fort
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Grain Fort was built in the 1860s on the Isle of Grain (not a true island) at the eastern tip of the Hoo peninsula to control the entrance to the Medway, Kent, England. All surface structures were demolished in the 1960s, leaving only underground passages.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 51.4571, 0.7194