The eight members of the Frank family and four other Jews hid for over two years in a secret annex of Otto Frank's warehouse in Amsterdam to escape Nazi persecution. They were eventually discovered in 1944 and sent to concentration camps, where Anne and her sister died at Bergen-Belsen in March 1945 at the ages of 15 and 19, respectively. Anne kept a diary during their time in hiding, documenting their daily lives and her inner thoughts. After the war, her father Otto was the sole survivor and had Anne's diary published, which has since become one of the most famous documents of the Holocaust.