From Absolute History.

This documentary unveils the monumental engineering and scandalous history behind the Château de Chambord, a structure so ambitious it was once deemed impossible. Commissioned by the young, visionary King Francis I and designed in collaboration with the legendary Leonardo da Vinci, this "stone giant" was built on a treacherous swamp using revolutionary 3D-like geometry, including its famous double-helix staircase. From hiding the Mona Lisa during WWII to bankrupting the French treasury, the video explores the construction secrets, the "coded messages" in its architecture, and the 500-year-old mystery of its missing floor plans.

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