The International Museum of World War II in Natick, Massachusetts, was a nonprofit institution devoted to the Second World War from its 1999 opening until its 2019 closure. Built from Kenneth W. Rendell’s collection of original letters, documents, photographs, and artifacts gathered over more than 50 years, it traced the conflict from the Treaty of Versailles through the Nuremberg and Tokyo trials. Its holdings included more than 7,000 artifacts, 103 uniformed mannequins, and vast archives, ranging from major state papers to personal items tied to leaders, soldiers, civilians, and camp inmates. It became known for presenting the war’s scale and human reality through authentic original sources.