How did Anne's diary become so famous?

Anne Frank's diary became especially famous because of the screen and stage adaptations. Read more about the impact of the diary across the globe here.
Visitors to the Anne Frank House read from Anne's diary. Fragment from the documentary In line for the Anne Frank (2014).

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So, who is 'Dear Kitty'?

Anne Frank's diary still has a lot to teach, 80 years later : NPR

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Anne Frank - Wikipedia

How did Anne's diary become so famous?

Honoring Anne Frank's Legacy – The College of Arts & Sciences at

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Holocaust Memorial Day Trust Anne Frank – easy to read life story