Anne Frank wrote The Diary of a Young Girl from 1942 to 1944 during the German occupation of the Netherlands. This chronicled when she and her family hid in concealed rooms behind this bookcase. Anne called it Achterhuis (Secret Annex). After the Gestapo discovered and arrested them, she and her sister died in the Bergen-Belsen concentration camp in early 1945. Anne was 15. The Anne Frank House is a museum. Among the exhibits are photos, family belongings and the original diary of Anne Frank.