Underground Double Helix

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Yesterday’s post about the DNA Tower reminded us that we have seen an even more amazing double helix in the Italian hill town of Orvieto. It is inside the well shown above, perched on the edge of a cliff.

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The16th Century well is known as Pozzo di San Patrizio (St Patrick’s Well). It burrows 60 metres into the ground, and visitors can walk down stairs which are in the form of a double helix. One stairwell spirals down to the bottom, and a second one winds its way back to the surface. Maybe Watson, Crick and Wilkins would have figured out the structure of DNA more easily if they had taken a holiday in Orvieto.

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