There are a number of German practice bombs (concrete bombs) on the heath in the Kennemerland National Park. The were used by the Luftwaffe in WW2 to practice on the heath from aircraft. The Luftwaffe had made a simulated ship out of sand and these practice bombs were dropped on it.
The bombs had a chemical liquid that started to smoke when the bomb hit the ground. This way the pilots could see if they had hit.
These practice bombs were found during dune restoration projects and 3 have been exhibited
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