This Ringstand Tobruk was built during the German occupation as part of the Atlantikwall (Stützpunktgruppe Castricum). The ringstand now lies on private land and is overgrown by bushes.
More information about Stützpunktgruppe Castricum can be found in Part 2 of the book 'Castricum en Bakkum tijdens de Tweede Wereldoorlog', written by John Heideman (2016).
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