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How does a double-helix staircase work?: Quick Facts

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Photos

Chambord Castle in the Loire Valley, France, features ornate towers and spires, with manicured gardens and a moat in the foreground.
Diagram showing the double helix staircase in the Chateau de Chambord, France, with a side view illustrating two intertwined spiral staircases around a central column and an aerial view highlighting their separation, allowing people to ascend and descend without crossing paths.
The double-helix stone staircase at Chateau de Chambord in France, with two people ascending separate intertwining flights beneath a vaulted, ornate ceiling.
Leonardo da Vinci
Chateau de Chambord in France, a large Renaissance castle with ornate towers and chimneys, reflected in the still water of a moat or canal in front.
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