World War 2 sea forts - Red Sands off the North Kent coast near Herne Bay/Whitstable UK.
More info here - en.wikipedia.org/wiki/Maunsell_Forts 
 
            
World War 2 sea forts - Red Sands off the North Kent coast near Herne Bay/Whitstable UK.
More info here - en.wikipedia.org/wiki/Maunsell_Forts