Justin Bieber is causing yet another stir for comments he left in the guestbook during a visit to the Anne Frank house in Amsterdam. After touring the museum dedicated to the memory of the young holocaust victim, Bieber... more »

Harriet Tubman

Susan B. Anthony

Elie Wiesel

John F. Kennedy

Joan of Arc

Marie Curie

Martin Luther King, Jr.

Rosa Parks

Helen Keller

Mother Theresa