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was built in the 1880s as a defense against Russian invasion. The Black Lighthouse is in its grounds. There are guided tours at weekends and public holidays, strictly at 11am and 1:45pm only. Because the fort is an active Defence Department site, visitors need to show their passports to enter (photo ID is sufficient for Australians). Tours also possible weather permitting weekdays at 11am. Note there are no toilets onsite.