Cobra Battery, Slangkop, Kommetjie, Cape Town, An Aerial View

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You can do a series on abandoned WW2 buildings.
Radar installation above Kleinmond.
Lookout buildings above Hangklip.
Canon bunkers at Steenbras River.
Bunkers above Llandudno.
Various cannon positions around Simonstown, Cape Town And Houtbaai.
Before every last stone is carried away.