Double helix staircase in the Chateau de Chambord, designed by Domenico da Cortona and built 1519-47 in French Renaissance style under King Francois I, at Chambord, Loir-et-Cher, France. The open staircase is at the centre of the chateau with 2 helices rising over 3 floors without meeting and is lit from above by a 32m high roof lantern. The staircase is rumoured to have been designed by Leonardo da Vinci. The largest of the Loire Valley chateaux, Chambord has a central keep with 4 bastion towers on the corners, a moat and an elaborate decorative roofline. The chateau was listed as a UNESCO World Heritage Site in 1981. Picture by Manuel Cohen
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