This sobering museum preserves the Secret Annex where 13-year-old Anne Frank wrote her now-famous diary while hiding from the Nazis for 25 months during WWII. Original artifacts—like the movable bookcase concealing the entrance, Anne’s handwritten pages, and the chestnut tree she longed to see from the attic—bring her story to life. Otto Frank, the only survivor, helped open the museum in 1960 to spread her message of tolerance. Today, it draws over a million visitors yearly, though tickets sell out months in advance due to its emotional resonance and historical weight.