In the summer of 1942, to protect Anne Frank and others in hiding, Johan Voskuijl constructed a revolving bookcase to conceal the entrance to the Secret Annex at 263 Prinsengracht. As Nazi threats ...
Who didn’t dream of a hidden door or secret passage in the house when they were kids? Some of us still do! [SPECTREcat] had already built a secret door in a fully functioning bookcase with a unique ...
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