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aerial photograph of Maritime Rescue Co-Ordination Centre, Langdon Battery, St Margaret's at Cliffe, Dover CT15 5NAHM. Originally built at the end of the 19th as one of the Palmerston Forts to defend Britain from invasion from France. After the second world war it was converted to a Coastguard station and now watches over the English channel, one of the busiest waterways in the world.