These Napoleonic fortifications are on the cliff-top a mile from the Castle. Much of the fort is not open, but there is a path along part of the fortifications. There is a short interpretation trail around St Martin¹s Battery, and a longer (1 mile) trail around the former Grand Shaft Barracks. The Grand Shaft is open only on a limited basis.
The area can be awkward to find – look for a car park and stop to examine the signage. It can make an interesting walk.
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Author Kim J Cowie's travel blog